It would be fun if people actually showed up at all. The 2 nights I ran league we had 6 people, 2 of them wanted to play am but didn't have a third to open the division so they played open to "donate" and have a good time. Meanwhile, I believe there were at least a dozen people playing on the course that would've thrown $7 down last year for random draw dubs that didn't want to play for KC Kash. Personally, I don't really think the pay structure of KCFDC league is a real money maker so I mostly attend to have a good time and get some practice doing it. I'd even entertain the idea of playing doubles if enough people showed up, but I don't think there's a payout structure setup with club for that. If you want to play doubles in the summer, they play every Sunday at 12:30 at Phill.
You're the one running the league so I say do it how you want to. I am just stating what I hear from many of Legacy Patrons. I would think more people = more payout even if it was doubles.