I have only had them once, and had an opponent use them once. It seems that they don't balance the game as well. I consider this an innitial observation since we only just started.
I have some observations however:
Inducements are really over costed as anyone can tell. If you are essentially bumped up to your opponents value, but can only spend it on over costed stuff, does it really help?
Second, when new teams join, they will statistically almost never catch up to other teams which are worth alot more, assuming they start at the $1mil mark (regardless of inducements). Wether you win or loose, you should gain the same amount of star player points on average and gain the same amount of gold (the winner may average 1-2K more). All teams should advance at about the same amount in SPP and $$ regardless of their value, hense the gap between new and old teams should stay roughly the same.
Morhiem had a system where you gained more experience for playing tougher teams. I think an idea along these lines may be needed when new players join, but of course we will see how it goes.