There is a fundamental disconnect with the concept of an Accelerator and the concept of a Disruptive Startup. If you do the math, honestly, they are a really crappy deal for the Startup. The "acceleration" they provide is little more than standard information, standard anecdote experiences, and standard MBA advice. If what they offered actually had they value they claim, they would be creating a startup themselves. Accelerators are parasites on your ambition and capability. Trust yourself, trust your team, and be adult enough to not sign up for a nanny program that is just going to treat you like children and take a portion of your equity for it.