1 BTC is not a whole lot to spare. Kris isn't asking for 25 BTC per user, just $5. It will take a while to get the investment back, but do you really need that $5 for the next many months?
No, but that 1 Bitcoin can earn me more (in some cases FAR more) investing it elsewhere than investing it in Kris' Minirig.
Of cause when you put it that way, but was just an idea, for making WalletBit the best online wallet out there. Sorry if I offended anyone with my idea.
Again I am open for suggestions in terms of rewards to people wishing to do pledges.