Well you just hit the nail on the head! Exactly!

The reason they aren't interested in airlines is primarily because they can't take their experience and pay with them to a new job due to seniority restrictions.

Regional airlines are designed to appeal only to people just starting out. There are plenty of pilots able to take those jobs but they aren't competitive with pay so they don't bother applying. This is the primary reason why they're not interested.

PS...I have no idea what bozobigtop said in that previous post.