I think that this found will improve the chance for a startup to become big, because with this extra money they can focus on the product and have a bigger found for advertising. If YC dose this is a win win situation for them because the companies that they found will get a bigger evaluation from the start. So now they invest $20K (let's say) and get somewhere to 10% if they invest $150K and still get 10% the company is worth $1.5 mil from the start not $200.000 like in the current funding.