I used this same site at TSN to run a post-season football league during the play-offs. It was a "just for fun", 2nd season sort-of thing for my fantasy league owners.
The mistake I made was saying "yes" to the question:
"Can we purchase more trades?".
It never occurred to me that anyone would spend real,
actual $ to win a "just for fun" thing.
But they did, and, of course, won.
Looks like you get 30 trades in this thing.
Which sounds like a lot - but the baseball season is long.
Maybe you should make some ruling, up front, on the purchasing of additional trades.
I don't know how much control you have as commissioner.
I know I had little, or none.
I don't know if you can turn addt'l trades "on" or "off".
But I think everyone should know going in.
If allowed, it's a good chance that the owner willing to spend the most $ will win.
I'd suggest NOT allowing the purchase of addt'l trades.
If "no additional trades", I don't know what else to do but put everyone on the Honor System.
BTW: Spring training opened TODAY! Unbelievable.