It's not about whether spending the money on something would make him happier or not. It's about whether taking the money would commit him to a social group, or structure, or organization he disagrees with.

Or maybe he just has other things he wants to be doing that don't require that money.

For me that's called being consistent as a man and it's the type of choice that separates men from peons.

So, let's not put a man on trial for refusing a gift. What's wrong with that? It didn't harm anybody I think...

Go Grigory Perelman!