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Storage is more than about somewhere to keep it, you need dry space with not too much temperature variation, don’t just stack them, animal/vermin free, somewhere where sets are easy to find and you don't have to move others to find the one you want to minimise crushing and wear. And obviously secure to avoid theft.
Volume. If you move house, you'll find stock takes a lot of volume and needs to be moved carefully.
Popularity, demand, supply.LEGO has gone up in popularity but so has investing in it. Will it still be as popular in 5 or 10 years, will people want older sets when there are even more good new ones, will the market be flooded with loads of stored sets.
Other investments, would your money do better elsewhere for doing nothing.
Hard work. It is hard work selling, boxing, shipping. It can also be stressful when you sell a valuable set to an unknown username on the Internet.
There are too many sets released nowadays, too many people hoping to get rich on the back of them, and the rate of improvement makes older sets obsolete much quicker so much less desirable in, say, 5 years.
The days of the 'Cafe Corner phenomenon' are over.
Reselling is still going strong, obviously, but I would say the 'bubble' has either burst or at the very least shrunk since those salad days. One way to go is to sign up to be an Amazon Prime re-seller, but they certainly take their cut - and it sounds like you're not sitting on any significant inventory yet.
For my part, I operated BrickPortUSA (closed) with one rule: Only invest in themes or a collection you wouldn't mind getting stuck with forever.
In 2020 I took the opportunity to sell a whole heap of MISB sets via Ebay that I had originally bought with a plan to building/using the bricks, but never got round to it. I'd never bought them to sell later on. I have to admit that I was genuinely surprised by what absolutely flew out the door at a pretty high markup, and then those that only sold after quite some time sitting around with some price reductions. There were some sets that I was making 6, maybe even 7x RRP on - but those were really the exceptions - some stuff never moved to the extent that I decided I'd rather keep it and part it out than sell so low.
You can play the game yourself. Use Brickset to go find sets released say - 5 years ago in 2017. Give yourself £1000 to play with, and then virtually buy the sets you reckon - and remember you won't have the same hindsight you'll have in this activity - will make a tidy profit. Now go and check the Ebay SOLD listings for what things have actually gone for - ignore the prices of what's up for sale, that can tell you nothing other than the fact that people often think stuff is worth more than it is. See if you make anything resembling a decent profit that way - and remember, your time is worth money, and you have to pay for P&P (and I would recommend insurance) too, along with any selling fees - Ebay, Paypal, whatever - all the time your margins are shrinking.
As @Huw said - I think that buying simply to sell really isn't worth the effort anymore unless you're willing to put a huge amount of your own resource into it - which I think would make the hobby a LOT less fun.
Finally, taxes. If you are in the US, Uncle Sam will have a reporting form from eBay about what you sold over the past year and eBay will send you a 1099 to enter into your tax forms come beginning of the year. If you get a software or tax expert to help, that will cost you as well.
Investment to the betterment of my mental health and happiness.
- No offering any investment advice-
I recall years ago seeing tons of great deals at stores, then LEGO movie released and popularity surged and now I rarely see a good deal. That plus the neverending awesome sets they release. I'd think it will limit your choices/pay outs. But hey, it's your call. It's your money. Do what you feel comfortable doing.
I used to sell a little on ebay and it was a lot of work for the little I was doing and it really soured my enjoyment of the hobby since the only free time with LEGO I had was listing and selling. I didn't actually get to build or play with my kiddo. So it was pointless for my situation.
The only good thing to come of it really is I should end up with a few more positive feedbacks and I have redistributed the sets to people who actually want them and may not have bene able to find the retired set in their local store.
I'm sure some sets will net more of a return, but as the saying goes, don't play with anything you are not prepared to lose.
Likewise for a battlepack sized set i'd expect postage as a 'small parcel' to be £2.82 (inpost) £2.98 (Evry) £2.85 (Royal Mail bought online) per item.
With this profit would be about £3 per set
Yeah, 70/80% off events have been every two weeks for a long time now, and even paying at the post office would be 4x £3.35. It is a case of knowing your costs before setting prices.
When selling multiple battle packs, it can be more cost effective to open them and sell the minifigures (they go as large letter and are typically what people want) then sell all the parts as a single bulk lot, charging one lot of parcel postage.