Such a pool, assuming you're not the only person using it, is usually a rather well-used patch of land, as opposed to the space needed for an entire skiing resort, considering outdoor pools are also used seasonally. And even if you are the only person using it, you likely still have much more bang per square meter with a pool. I haven't heard of a pool that is as extensive as a skiing resort, stretching through often tens of kilometers of otherwise undisturbed nature.
But yeah, I'll admit it, I don't really believe my feet will decide the vote on where to draw the line here, though, therefore I have to try make skiing look as bad as I possibly can.