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The sorting of the mixed box will distract you from opening new stuff. Works for me.
Buy one - build
Buy two - build one and save one to resell
Buy three - build one and save two to resell
Buy three - think about the value of the last things you sold and struggle to open any....
Unless you want a lot of headaches around storage, packaging for reselling and parcels going missing, to name only a few of the issues. I would suggest you just open and enjoy.
There are a lot of people jumping on the buy to sell bandwagon and personally I think that with the popularity of Lego as a brand at the moment and the large amount of sets available, just buying sets that you want to build can be costly enough let alone buying them to wait a few years to see if they make money.
If they are really good sets that would have increased in value to a point where it's worth sitting on them for a few years, building it but keeping it complete will still make it a saleable item but you would have had the enjoyment out of it as well.