It's unusual. You have two issues...

1) Was all that time real? If you have original logbooks and maybe other documentation and can explain how and why you accumulated that time, it should be OK. There are plenty of businessmen out there with thousands of private pilot hours, although many of those guys actually hold a commercial for insurance purposes if nothing else. You will wan to avoid giving the impression that you were compensated for the time in any way, or that the time itself was compensation. If you can convince them that you are an long-time, avid, recreational pilot who has decided to fly professionally, you should be OK.

You probably don't want to give them the impression that you have spent years and years struggling to become a commercial pilot, and are just now getting there...

2) Overqualified means someone who is going to get hired by a better (ie major) airline in 6-12 months. As long as you don't have a significant amount of turbine PIC you are probably not overqualified for most regionals. Also, since you don't have a CFI or any professional flying experience, you may be viewed as underqualified at some regionals.


Bear in mind that certain regionals like career pilots, others want you to fly for them for a few years, then LEAVE so they can replace you with a cheap new hire. Unless you know for sure what they are looking for at the interview, try to stay in the middle of the road on that...