Time Piece Farming VS Leeching

Of course a Bishop killing Skeles without Genesis is slower, but it's by no means impossible. They can still pull solo exp rates comparable to most non-mages, plus they have HS. People always forget that Priests were actually wanted as attackers at Gobies and Himes in addition to HS support prior to 4th job.

Skeles is very cheap without Gen. Hell, it's not that expensive even with Gen if you 1hko or have an HB mule.