A few years ago, the franchise fee was reputed to be in the low seven figures
http://www.sportsbusinessdaily.com/Daily/Issues/2008/04/Issue-152/Franchises/Minor-Interest-NBA-Teams-Slow-To-Run-Their-Own-D-League-Club.aspxThe average D league salary is between $12,000-$24,000 a year, so that would be a payroll for players of about $300,000. Add another $50k for coaches and support staff. There are 24 away games, so teams would spend around $500,000 on travel.
I'm guessing that it costs around $1.3m to run a D league team for a season, assuming the team has a sweet arena deal (and a sweet concessions/parking deal too) . Assuming teams can bring in $200,000 in sponsorship fees from advertisers and the NBA club that they service, and assuming that teams bring in no money for TV/Radio, a team would have to do a live gate of $45,000 a game to break even.
D league teams do from 2000-4000 fans per game, with the Red Claws averaging a hair under 3000 last season. I'm guessing the Red Claws broke even last year. Ticket prices average $15-$20).
These are all guess-timates. If a team is located in an area with no pro teams, and builds up a fan base, like the Red Claws seem to be doing, ownership could make a small profit.
I always thought my city, Providence RI, would make a good D league site - close to Boston, good basketball history in the state, already a very successful minor league hockey team (Providence Bruins), nice arena. Our area also hosts one of the most successful minor league ventures anywhere int he country, the Pawtucket Red Sox. Unfortunately, the Red Claws have already affiliated with the nearest NBA team.
A half decade ago, I looked into bring in an Arena 2 indoor football team to Providence, and my research pointed to me losing a lot of money. The formula for success for minor league sports is 1) Affordable, family and fan friendly atmosphere, 2) strong tie in to youth leagues in that sport, 3) sweet arena and concessions deal 4) deep pocketed ownership that can withstand losses while the franchise gets established.