Why do we play Maplestory?

I recently checked how much money I've thrown into WoW and I'm completely appalled as to how much of a difference the total amount of money I've spent on WoW and Maple came to be considering the 3ish year difference.

I've thrown a little over $2500 into Maple over 7 years. How much for WoW? 60% of that amount, and that's including the race / server / faction changes and expansions in the span of 9 years (soon to be 10).
Frankly I'm not sure how I should be feeling after this discovery, but I can say for sure that I'm 100% glad I left Maple over a year ago.