In theory, I agree. In practice, I've realized that most of the jailbreaking phones/tablets are used to download illegal applications and/or without paying. I know this is a somewhat contrived statement, but this is from what I've seen in company/university/engineering departments I've worked/studied.

Note:

I myself had to jailbreak my iphone to install spotify (and asked a friend to pay for it since he's outside of Canada). For some reasons, spotify is illegal here. (Yes, I know, I illegally downloaded an illegal application to legally download/listen to music).