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Don't know when the last person to donate 10 BTC took place. But it should be reconsider if only lowering by a little bit.
Why? Just to piss off all past donators who were promissed the amount would not be lowered?
To get more people to donate.
For what? 1.5 Million USD (or more? Not sure about the exact number) has been used for new forum software, the income on ads is enough to cover the hosting and give a little to mods.
Or perhaps create a new donator ranking that's lower. But I guess keeping it at 10 is better than the opposite conversation, which is Bitcoin crashing to the point where 10 BTC is too little.