I don't think the money is the issue here, which results to many companies being funded because of the relatively low cost for them to bring up to life startup

I don't think the money is the issue here, which results to many companies being funded because of the relatively low cost for them to bring up to life startups, comparing to VCs. So, they invest enough money to get u going. Their actual contribution is their network and their guidance, which isw hat consumes their time and what everyone applying wants. So, the quantity and the limit of the "many people" is relevant to how big YC is and how many people they find worthful to invest.