Unless you’re trying to achieve 4K on a projector, you definitely don’t need a $12k model.
Similarly, sound is dependent on the user. I’ve used many projectors that had decent speakers. Yes, speakers can be expensive, but not outlandish unless you’re going for an audiophile set, but then you’re going to drop money either way because most TVs don’t have movie theatre level speakers.
I’m just interested in having a big enough picture without paying a fortune or having unskippable ads while I play Horizon: Forbidden West.
An $80 projector works just fine for me.
I’m not trying to build a theatre or anything here.