Too general to be particularly meaningful. You make the effort to read because it's required of you and find yourself involved in something you love. But the next kid puts in the same work and can't wait for recess. Or, as in my case, you see adults reading and they seem to enjoy it, so you want to sample it and see if you'll feel the same way. You take the plunge and love the water...or you don't and you likely don't swim again unless someone throws you into a body of water.
I don't think effort is the reason, only a gateway through which we pass into experience. How we respond to the experience is everything.
You're still skewing with that construction. Rather, there are a lot of reasons why people might try something they want to accomplish. There's an element in there that goes to that foundational "why?" I noted and you find tangential. I think it's demonstrably crucial to the discussion and I'll come back to it in a moment.
You're missing the key element that distinguishes with each of your examples: the actors desire to act and do. I'm a step back of that suggesting that the important factor is in the why of that. If that why isn't present the rest fails. They aren't forcing themselves to like something they don't want to like. They're acclimating to a thing they want, either for the thing itself or some related reason they find compelling.
The important thing is their desire to do and encompass.
That's conflating the commission of an act with the desire for the act, but your example contradicts that since the prostitute's desire isn't for sex, but for power/money.
