Plenty of gems, and they replenish daily! At the end of this summer I took 3 days off from my "regular work" and did this for a few days because I think it is fun actually. Landed one domain I sold for $2800 and another for $300 to a local company. I ended up teaching my cousin's boyfriend how to do this and he can usually find one $1500-$2500 domain each week. Not bad making $6-8k per month when he was making half that at his restaurant job!
Many different ways to monetize. Slap up some content and use in your PBN, sell OBL, sell the entire domain <--- personal favorite.
The only "problem" I can see, and this may not be a problem for some people, is that it is not very fun to scrape, check and investigate domains all day every day for weeks, months...
