Disclaimer: While I'm in favor of tipping porters/buffers, I have rarely ever gotten a tip when doing buffs (and in most cases I am giving out plat to lower levels).
I think what the OP was indicating is that if you have it and are stingy, you are being rude.
If you do not have it, he doesn't expect anything from you.
Using, "well, you said donation so that means I can give you nothing even though I have hundreds on me" is just a rude move.
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