Rob McElhenney was so inspired by watching Sunderland Til I Die that he and Ryan Reynolds bought Wrexham. He's said that he didn't think he could afford a club like Sunderland though, so they went for a lower league club instead. I'm fairly sure they could have actually bought the club for a couple of packs of chewing gum if they'd really wanted it.
The documentary has brought them some worldwide recognition, not necessarily fans.