Hey Lucky, we'd love to have both you and your brother aboard! I've co-managed fantasy teams across multiple Yahoo leagues, including this one.
Speaking as a longstanding league member, we have a live-and-let-live philosophy about regulation. I can only think of a handful of instances across my many years where the thought of vetoing a trade was even discussed, but in all those instances things never went further than that.
Windy is the league commish, and a good one.
Like I said, trade vetos are few and far between. A majority of owners would have to agree before such a thing happened, but it would have to be an awfully controversial/egregious trade for it to get to that stage.
The fee for entry is $160 and the payout structure is as follows:
1st Place: $600 ($580 + $20 for charity pool
2nd Place: $500 ($485 + $15 for charity pool)
3rd Place: $400 ($390 + $10 for charity pool)
4th Place: $300 ($295 + $5 for charity pool)
Hope this answers your questions!