The lh3 mvp's give "okay" job levels but it's easier just to buy a leech since you'll probably die alot in the process of trying to corner an lh3 mvp.
Anna got like 4%(?) job level at job 64 on her hw after dying 1u571038479184-0130-pfupjdfaifh98wq129UR- times...so yea.
It's safer, in my opinion, to buy a pro lh3 leech.