a) how accounting works
b) that time isn't infinite good [typo?].
Accounting for such huge companies is a bitch. They usually barely manage to "close" the books within accounting periods anyway. And no, expanding the accounting office for few extra bucks isn't worth it This is why big companies choose not to sell directly - they rather want to receive bigger amounts of money at once from distributors than counting every small transaction alone. You think they are playing checkers now and watching redtube so they have plenty extra time for accounting your pennies?
For smaller companies, indie devs etc., it should be much easier, and indie companies usually provide you with bank account data needed for donations.
Also, why do yoy ask a question if you react with aggression to response? No wonder your rep is the lowest of lows.
Consider being blacklisted.
I think your really overestimating the amount of effort it would take to accept a donation, regardless of it's size, but since I don't really know shit about it in the first place I can only guess, so since you seem to know so much about it (or are pretending to) I won't argue further.