Is Y Combinator worth it?
Y Combinator has one of the strongest brands of any investor, which matters a ton for recruiting.  It's very hard for engineers considering working at an early stage company to determine whether it's legit or not, and Y Combinator is probably a better known name than any VC.  Personally when I was looking for jobs I'd immediately disqualify any company that wasn't backed by a relatively small list of investors and YC was on that list.