The retail freya server guys did not manage to kill valky/anthy with all the online they had got and the retail-like enchantments (fyi with enough $$ invested you could get up to +20++ items). This was because NCSoft Fed up a bit and made the two bosses overpowered. Making valky easier could be a reasonable solution as well (the neckle is not necessarely for mages only :P ).
P.S. 3-4h. of repetitive actions is kind of harsh, making it 6+ is ridiculous and i would not ever dare to say it is possible to get someone to do this no matter the life quality of a server :s