I'm like bip! in that max buyins to me are a guidline rather than a rule. I have no problem with anyone going north as long as it's open to everyone. And for special cases I'm ok if only the whale gets to do it.
I played in a game in DC for a few years which had a nominal 4k buy-in "guideline" but we had one player who always wanted to cover the table when he sat down, and whenever he lost some money (or someone else won some) he rebought to cover. No one ever objected