Many will point out the fact the introductions and the opportunity to work with other startups are worth more than the money. I want to say the money is worth it too.
We are self-financed and so we do contract to pay our living expenses. It is working great for us, but often we will get sucked in client projects. Those distractions have been costing a lot in term of growth. 5% for the intros and money to just focus on your idea for 12 weeks is certainly worth it.