They wouldn't be able to pass a $5000 wall.
Yes, they would. That's chump change for most professional Indie developers, even if it is their first title.
Are you aware of the licensing/certification costs on consoles?
My point is that Valve have been, and will continue to, stubbornly refuse to put the certification system in place that defends against broken, buggy stuff. Certification is the process of making sure that a game meets a set list of criteria. While it doesn't prevent boring or ugly looking games, it's designed to prevent broken (technology) games and stop dangerous practices (such as private data collection).
The reason certification generally works at weeding out the bad games in the process is that people making bad games are looking for a quick buck, and don't want to have to go through the VERY long hurdles of the certification process (it's not uncommon to fail the process about 3 times minimum before an RC gets greenlit), as it's financially not in their interests.
But no, instead we'll keep letting PC developers piss all over PC gamers.