If it weren't for YC one would have to spend 50% of their working hours having coffee chats and preparing demos, since investors generally had their own contorted idea of what a good demo is before they would invest, and it was usually not what the customer wanted. Being able to get twice as much work done in return for 7% was a good deal.
I don't think that applies anymore, sadly, with the large batch sizes they accept now. Nowadays you'll have to waste half your summer having coffee, not have guaranteed investment, and still give away 7%. Not a good deal.
Also, if you live in the bay area, it's fairly easy to come across most YC advice and get investor intros just by going to enough house parties with seasoned founder attendees.