I've purchased over 10k plat, but that's just money. The time I've put into levelling all the characters was insane. Even when I put on 4X runs, it takes about 10-12 hours to level a character to 50; after level 50, its pretty much a 4X pot run per 1 - 1.5 levels up. My goal was to have one character in each class for every set in this game, and I've managed to accomplished this goal between my accounts until Mt. Fang came out. Noticed I have 3 characters at level 46, those are for Mt. Fang sets, but I gave up because it was too tired :)
If I only had Evolt and spent the time and plat just on Evolt, I will definitely have over 1 million Kills, probably close to 2 million kills :)