Earlier quoted context omitted.
This varies hugely by school. A lot of state run Universities have very competitive salaries because their reputation depends on retaining rock star professors. Adjuncts are a different story. I taught as an adjunct part time at a state school where professor made $150k. I made $5000 per course. I did it more of less for fun because I like teaching. Which is not bad for extra pay on the side but terrible if it is you…
Are compsci phds in high demand in academia, or do they suffer the same oversupply condition as the general professorial market?
That's for adjuncts though. I think for full-time professors they have PhD requirements per the accreditation boards that they need to maintain. But once the quota is met they can hire anyone.