Difficult for such a game like a sim, because sims usually lives long with scenarious from users. There are so much scenarios and stories to tell, that a model like wot isn't applicable to do things like that. The whole freedom of a typical sim will suffer from this. what about offline flyer and their needed contents? Will they pay?
Also clear is, that such difficult and accurate games with such a small comunity is hard to produce for 50 bucks per user. battlefield could do, even with just 1000 players playing it! Why? Because it is just copy paste with new graphical content. noone takes care of differencies or accurate differencies in weapon impact, flight curves... They just accept eveything as it is as they do not know better and the game just needs to provide motivation and fun! Thats it, but costs are low and they earned a lot with bf3 and the addons, which are now also 100-120 bucks. They earned a lot and do not know, where to put all the money.
Same with wot: casual game, easy and sime fun for casuals and alsi a bit funny for fans of tanks. No accurate data needed, just balancing. I drive it as well and already spent about 300 bucks, although my first intention was just to buy premium to achieve the tanks faster.But now I spent money for 2 years premium, + 1 tank and several times using gold to get out the free xp on some tanks. Never thought I would go that far, but I am just average in the core players. Some of them already paid 100-3000 bucks for this game with nothing special, just casual gaming.
It is difficult, but u can see: I would spent also many bucks into a game which I like. But sims are another world and I do not know, if this would help. Perhaps such games, where u need some own imagination to fill it with life, is dieing out. Hope not. I am still dreaming for a fully simulated, graphically gorgeous worldwar 2 online with clustered servers, a big front and every aspect u dream of. Worldwar 2 online in good would be my death
Big sim mmorpg with millions of people! just dreaming...