Most of the guys who post on incel forums have college degrees and good jobs.

Yeah and this article posits that more educated dudes are more likely to be incels:

Overall, male virginity in the NSFG is associated with higher education and residence with parents. On the other hand, data from the GSS suggests that not having had sex in the last year may be associated with less education, although this isn’t a measure of virginity.

But whatever the direct effect of education on never-married men, the primary cause of the rise in sexlessness is simply the increasing delay of marriage. The delay in marriage has numerous causes, of course, but probably the most powerful driver of marital timing also relates to education. Men and women are much less likely to get married while attending school, and across times and countries, an increase in the years of schooling is associated with later age of marriage, though more-educated people do tend to get married eventually. Thus, as more and more schooling becomes necessary for a good middle-class job, marriage gets pushed later and later, leaving more young people (men and women!) companionless and lonely.