Helps if you read the article Jerykk. This isn't only an MMO game. The MMO components are optional. If you want to just play the game without them then you buy the boxed software. If you want the persistent aspects then you pay the monthly fees. This kind of development should be lauded, you get to choose what you want.
In general you pay monthly fees for ongoing content and maintenance fees. The customer decides if that's worth it or not. If a product doesn't warrant monthly fees, don't pay them. If you like it then pay for it while it's fun and stop when it isn't. Too many people view monthly fees as a contract or something, you are not beholden to the company to keep paying.
Playing: Wildermyth, Mass Effect Legendary, Returnal
Watching: Deadwood, Dune, Evil