1) Subscription Fee:

Pros:
- You are guaranteed new content
- Don't have to wait for expansions for new content
- New content should come in through patches

Cons:
- Rate in which new content comes in isn't constant
- Subscription payments add up over time
- New content may not be worth the subscription fee
- Forced to play the game daily or every few days in order to make the payment worth the money.
- Some new content may only be made in expansions

2) No Subscription Fee:

Pros:
- No payment to be made over time

- Play at your own pace - no obligation to keep paying continously
- No need to give billing infomation since the price you paid for the game is all the money they need

Cons:
- Major new content only made through expansions
- Possible new content coming in patches is not guaranteed
- Game's community is most likely a younger audience due to no subscription fee

[Edit: Removed the subjectiveness of my last con in no subscription]

Your last con is not a very good point. You don't even know that it's true.

^Agreed.

I wouldn't pay for any MMORPG currently on the market.

I must say I love GW's scheme of no monthly fee, and pay for expansions as you want them. Though I wouldn't mind paying a monthly fee if it were less than $15. $5-8 probably.

I hate the idea of paying for playing after I've paid lots of money for them games. Sure, it keeps the servers up but I'm a poor finn

age/ability to afford a subscription doesn't necessarily correlate with the maturity of the gamer.

i like a subscription, i mean, if a non subscriber game spits out a dozen expansions in a matter of months, you'll be way over your head... i buy WoW in 6 month chunks so it works out a bit cheaper, it isnt all that bad and i dont play it relentlessly like i once did.

Guild Wars...mmmmm