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We all have different opinions on what "completion" is, so it will be difficult/somewhat pointless to argue back and forth over whether it is necessary to have Mr. Gold or not.
If someone else feels that Mr. Gold isn't a part of series 10, then that's fine. In this case, I believe it's all dependent upon what the collector feels/wants it to be.
The other justification is cost. If he is too expensive, don't buy him. It is not a stain on your reputation as a collector if you chose not to buy one. Collectors should collect what they want, not what other people tell them they have to.
Of course, true completionists will want him, and that is their choice. Collections including him will be worth more than collections not including him (obviously) although if you are not going to sell your collection this is neither here nor there.