.I know people in my country who has tons of simcards so I think that 2k numbers is still small compared to others. His price is not cheap tho because I've seen some giving 0.05$ or 0.10$ for verifications.
Anyway, this could be a good service if someone is looking for a bulk  purchase since you can provide it.
You may want to try posting in threads of those who need the verification because they don't really check out others threads.