If the revenue stream increases the price could be lowered and HTC will still make more money. This type of product doesn't enjoy much price elasticity. In the end it's all about subscriber numbers...
a lack of elasticity implied that you can change the price and it will not effect the demand. I'm not sure you meant it that way, But I agree your statement. If the price goes up, I keep playing.
I have more invested in my rig than I will ever spend on a subscription at ~15/month. For players that play many games this may not be the case, but I bet if the price were to go up, most would keep playing. Heck they spend more hours on-line than they do watching TV. I'd bet they're cable bill is way bigger than thier HTC bill.