It's a very effective way of protecting themselves from downside risk -- if all the startups bomb, the startup founder have nothing and the investors have nothing, but Bootup Labs still has their $50k/startup -- which might be part of the reason why they've had trouble convincing VCs to invest. I think many VCs would be skeptical of a startup CEO who said "we have no revenue and a completely untested business model, but we're going to pay ourselves $100k salaries with your money".