I'm one of those that agree with you! I always wait to come back to the game at ".2" so I can fly. So, in a way, you're right, they'd not only make money from me buying flying at the start of an expansion, but I would also pay them 15$ a month to play the game all those months that I quit for now.
As far as my avatar, it's a picture of myself I manipped. I make adult games for a living as "The Anax" you can find them here:
https://tfgames.site/?module=search&author=39088
They are all free, so enjoy yourself (as long as you are 18+ of course). I earn my living on patreon. "The Anax: Call of the Cursed One" involves my alter ego here. Though in real life, I always wear a suit and bowler every day. Pretty much since I was a child. Turns out that I am autistic, and maybe that's why I only like wearing the same thing always. But, it could just be who I am!