They get kick backs, but they don’t sell that high over MSRP and many people are much more savvy about cost of new/features thanks to Edmunds, Cars dot com, KBB, and dealer incentives to move inventory.
If a dealership is making money on new, you’re not doing your work with car shopping. Most don’t make money from new.
I mean, unless you know something I don’t? My brother in law was in sales for Chevy for a few years so that’s where I get my info from.