As i said we limit this option. We get this "extra builder prize after winning a war" maybe once per month, or once per two weeks (or six weeks) depends on what is the best for us.
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Actually it's quite the opposite, the upgrades take so long at th10 you always need an extra builder because all five are constantly working. I don't think supersell will do this though like you said it could hurt gem sales. I do wish they would sell a sixth and seventh builder though.
Good idea but would not work. CoC is a game that takes time to progress but if you want to speed things up you spend gems. If you run out of gems you can buy them. That's how supercell makes money, so just giving a builder away would not work.