Yeah the MMO fees are a little high, but i think with more competition they might come down. That isn't to say you'll see free MMOs with good content additions anytime soon, the cost to keep something like EQ2 or WoW running is absolutely absurd. I happily paid for EQ1 for MANY years, and am paying for WoW now (even though I haven;t logged in for months). The games just provide so much enjoyment for the cost you just can;t really complain.
Compare 15USD a month to anything else you do for fun that cost money. Go to ONE movie, get half a tank of gas worth of travel, buy a DVD... 15USD doesn;t go far these days, and with being able to play almost as much as you want (barring downtime/patches) you can then see how good a deal it really is.