It looks like you're new here. If you want to get involved, click one of these buttons!
The old business model:
Smaller market had to earn every sub. Devs were forced to make a deep gameworld that would keep players hooked for years just in order to make a decent buck. Hardware and bandwidth costs high.
The new business model: (mostly)
Huge market. Make it fast make it cheap, boxed or F2P. Count on massive number of frustrated or A.D.D. gamers to at least try your game get hooked for 6 months. Money made through cash shop or boxed or online sales, enough wont leave due to cash or time investment.. Keep server running for practically nothing (cheap bandwidth and VM ware server). Start new cookie cutter MMO, rinse repeat cash grab.
My point is not that every MMO works like this today, but a fair number certainly do and the numer grows every quarter. 8 Years ago this would of been an unsubstainable business model, today it seems to work just fine. Allot of the MMO market has become the same as the console game market..