Especially if your startup isn't purely software, and involves some operational or hardware expenses, $500K is a no-go.
It's also the ballpark of what 2 technical founders could easily make by working for ~6 months in the bay area, and not have to give away any equity at all.
So if you're doing it for $500K, I'd say there are better ways to get $500K than giving up 7% of your company.
Now if YC handed out $2M and cut their batch size by a factor of 4 (being more selective in their applications), I think it'd be a really good play for them.