Oh come on, it does take long enough to be annoyed with it and considering there's already a mechanic in the official games, the thought of spending hours on just EV training takes the frustration to a new level. Especially if you have a lot of pokes to train.
Now I do know this 'isn't like official games, this is MMO, you need to grind bla bla...' but not everybody has the hours everyday to train. I'm not saying 'make this like showdown' or anything, but making it a little more convenient won't hurt at all.
It may decrease the profits of daycarers, but it will in no way remove them.
Having Power Items will not mean 'no work will be put into EV training'. It'll just be more convenient, and give those with less time on their hands a chance to train their pokes themselves and keep their money in their banks.
Competitive Pokemon prices should be more dependent on the said pokemon's IVs and Nature anyway. Level and EVs should have little effect on their prices.