the only problem with that is you could abuse it...and sit there and rez kill some random NPC that you (for whatever reason) hold a grudge against...or basically just sit there and hammer with spells/attacks to insure that you get that skill level you want without paying some NPC for it...
Yeah but you can also do that just fine with a summoned Atronach. EVERY skill in the game is easily abusable to max.
Still Id make ressurection a Master level restoration spell to be honest, or at least expert