I'm not sure the salaries are better. Most R1s are now offering 90-120k starting in my field, but regional teaching Us start around 50-60k, with liberal arts colleges in the 50-80k range.

The point about the lack of opportunities for advancement/moving due to the course preps and teaching taking up your time is very true. While your friends at R1s are on pre-tenure sabbaticals, getting course buyouts, and teaching a nice grad seminar for a semester, you might be doing 3-4 new preps a year and likely getting piled with service work.