That goes explicitly against the code of buy nothing which is to reduce consumption and give freely with no strings attached. Obviously it's still a problem if someone is monopolizing donations as that discourages participation by a lot of people and hurts the community aspect of BN. As some other commenters have mentioned, a good mitigating strategy is to encourage giving to a random commenter after a couple hours have passed rather than first-come-first-serve.
I think this just shows that unregulated, no strings attached, anarchy style, etc is low hanging fruit for exploitation. Exploitation happens, and we need to deal with it, in my opinion, with attaching some strings. Like with the difference of the AGPL and the MIT license.
Your mitigation strategy would work though too, I think. If it's a raffle kind of thing, then the resellers wouldn't have such an easy time, so it makes this thing less desirable for them.
