In the most recent episode of The Flash, "Family Matters Part 1," Cisco mentions that he doesn't want to be "stuck" working at STAR Labs for the next 40 years while everyone else moves on. And I realized something: Barry, Joe, and Iris all have their own jobs outside of Team Flash, but for Cisco and Caitlin (and apparently Chester as well now,) STAR Labs is their day job.
Before the particle accelerator explosion, it was a well-regarded research lab that was presumably funded either by grants or by selling their research or similar, but since then, it seems to have been transformed into a full-time superhero team headquarters almost exclusively. I don't believe we've seen it producing any products or services since the Flash started his crimefighting work.
So I have to wonder, where does it get its revenue from? How is it keeping the lights on? Where does it get the money to pay the salaries of its employees, Cisco and Caitlin?