Are this actual donations or paid accounts as in NarutofanPlus? Either way, it would be scam. In case of donations, if he sets a value to reach, said value must be the one the site needs, asking for more is seeking to make profit. In the case of paid accounts, it is the same as in NarutofanPlus, charging for others work, while that people releases it for free.
I understand the idea of trying to make some business out of this, but it is the proper thing to do to advise the ones lending you the money, that you're seeking to make profit. No doing so, it's scam.
Still, I really don't know about the values, but if they are indeed accurate, then that guy's business would be obvious.