Widely used business model, based on a simple concept. Any feedback, any suggestion or any critique you might have(about any game/business) - this model, should answer the most.
Look up the details - it could turn out to be some fun experiment. Basicly:
? symbol is always considered expense -
Building a new WoW expansion costs a lot.
Star symbol is always considered expense -
Surviving the WoW killers costs even more(market domination).
Cow symbol is always considered wealth/income -
Whatever you can think of, that took time to fix/change - was most likely a plan from the beginning(milking).
Everything is here - including timegating, grinds and seasons, raid tier, zones opening up, new mounts, "wait for the upcoming changes" etc.
Creativity is expected.
It's all about earning the expense back, before entering another expense cycle.
Do you have any good idea? Consider features involving milking - the chances is that they would listen.
Dog symbol is always considered expense -
Expansion got old - get rid of it and return to start. In this case - about every 2nd year.