I think Lemieux gets a little to much credit for saving the Penguins franchise. If I remember correctly, the team owed him a lot of money and the main reason he bought the team was to ensure that he collected what he was owed. I'm not saying there was anything wrong with that or that he hasn't been a good owner, just that his motive wasn't completely altruistic.
If I recall correctly, he didn't actually buy the team, but the outcome of one of the bankruptcy proceedings the team went through was to convert the deferred payments he was owed into an ownership share.