Base cost of maintenance - A PC12NG has a base A-check cost a little over half that of an a320. In DOTM, A Navajo has a base cost 2/3rds of an a300. Again, I don't know how maintenance costs compare IRL. And I don't know if Pipers are particularly expensive compared to other sub 20 seaters. It would help a bit if the base cost was cheaper, but it's not a big problem.
This one's minor, may well be too much hassle. I don't know how based in reality current base costs are.