Why would you learn it if you're not going to use it? (Not being a smart a**, just really curious.)
No worries.
Again, Maya as an example....I would learn it in order to apply at studios that use that app in the creation of 3d content. Knowing how to animate (art) has NOTHING to do with learning Maya (tool)...yet many studios list the software as a requirement an applicant must possess in order to apply. The studio will of course have paid for licenses. Also, learning Maya and the concepts of 3d creation/animation tools will very likely "cross over" to other apps that a studio might use instead of Maya such as XSI, 3dsMax or their own proprietary software.
Another example, maybe I want to work with a photographer and the way to get my foot in the door is to perform image touch up, etc. Knowing Photoshop would be an essential skill to be considered for that position. The photographer will own a license for PS.
Such examples are endless.
Let us not forget...sometimes companies *want* their software passed around. Case in point, FCP when it was first released. Apple wouldn't say this publicly, but, "back in the day", they stopped just short of flat out encouraging "sharing"! At the time, getting a base of users was critically important.
I don't want to sound like I'm encouraging theft. No doubt, MANY programmers are seriously(!) hurt financially by P2P networks etc. It is WAY out of hand....clearly.... but I don't think the solution is one single alternative of spending thousand of dollars for software in order to pursue a career. I don't think the price of admission should be so high as to allow only the upper middle class to enter a career in digital content creation.
Bottom line...I think it's just wrong that someone be denied an opportunity to LEARN or develop a skill because the software costs $7000! Wanna be a Maya VFX nCloth TD? Pony up $7000 **just** for the software..then sign up at TD-College for your education. The Maya Learning Edition ain't got nCloth or Fluids or Fur. Is this a complicated issue? you bet....which is why when I start reading all of the "black/white"..."holier than thou" posts, I take the other side.

Btw, most of those holier than thou posters have iPods full of unpaid for mp3s.
peace