Considering most people are holding (or claiming to, at least) these events for housing, as long as you're talking about sums with only three zeroes at the end you're not going to change anyone's mind. The challenge is that big cash is needed for houses (more than asking price, if people gouge you for millions to let go of the land as well) and nobody is patient enough to do real work for it. Hence, auctions. A couple of hours, millions of gil. Get the right person on the block, make four million gil as all of their fans open their wallets.
Alternatives that don't make you six zeroes aren't alternatives.
Alternatives that don't make you six zeroes aren't alternatives.