I played them in the league games, they were good enough to beat my crappy opposition, and then fired them before the financial update. It is cheaper than keeping them. I'd buy a new set each week, my only search criteria was that they had respectable defense and $1000 max bid, and I'd only buy guys with respectable GS or better. I only paid for my trainees, about 12k a week :)
I had to buy some half-decent guys for the playoffs though