here is what i think:)
this whole "make your masterys lvl 150/100/50" sounds a bit irrealistic to me. to level up your mastery to 150 you have to be umm lvl150. so good luck grinding.
seriusly. how long could it take (lets forget about level cap) to reach 150 even with botting 24/7, 2x xp scrolls and masterys=char level? are you really going to play SRO for the next 5 years or so?
another point of wiev: lets say you WILL reach lvl150. there are skill reduction potions in item mall (even with crust hearts. at lvl150 would you care if reduceing skills would cost you like 100-200 million gold?).
so why make your char weaker then it could be, by not adding some more masterys for some very useful skills?
of course, if you can manage the sp. what i cant
