That is not the issue though, you'll regen you MP a lil slower with a -10 MEN than with a -8.
I did exact same thing, cause I ain't paying 700k per -4 Dye, and it doesn't bother me one bit, I should mention that I'm a Necromancer. Necro's and SH should be ok with that.
Now if you're SpS or Sorc, you'll probably get screwed, well, especially if you're SpS since they don't even have lvl 1 B2M skill.
200 mp per 1 men ?? well..I have 1200 mp at the moment as a 42 necro.if I get that +4 int - 5 men from the shop, according to your calculation I only have 200 mp left ?
the only thing that sucks about -men is the greatly increased spell cancel rate. nothing else really makes any difference. (well mdef, but you still have a lot anyway)
The difference is very small, small enough where you probably will never notice the difference in mp regeneration rates. I am down to -9 men as a spellsinger, and regenerate about as fast as other spellsingers my level who I know have more men than I do.
yeah i was -12 on my necro all the way to lvl 74
didnt feel a thing except maybe high spell breckage and higher debuff rate
but to be honest spells break alot anyway (pvp) and debuffs land at such a high rate its hard to say how much it effected me