IMHO, it is rather rare but very worthwhile. I know such an earner/learner and has done more than most full time learners . He has supported his family bekavod and finished Sahs Babvi twice on his own and shas Yershami once, all without daf yomi and artscroll. Most full time leanrers after many years have significant worries that either forces them to live in poverty and suffering on social programs, which are not enough with tuiton, food and housing, or to get a starting level job.
Good luck and it’s worth the wait.