Only for shows that aren't on Blu-ray or I can't find for free in at least 720p. I had to buy season 4 of The Real Housewives of Atlanta because they're the only place it's available in HD (except like Amazon but Amazon doesn't let you download the actual files). I download it in 1080p from iTunes and the quality still isn't that great. iTunes isn't really good for HD media since they compress it so much. I'm picky with the quality of my shows/movies (I always get 1080p if possible) but I have a Retina MacBook Pro so I'm not going to watch no 480p ****
I also own all the seasons of The Simple Life but that's because I didn't know about illegal downloading back then
If I were you I'd just illegally download those shows because you could easily find them in 720p. iTunes shows are expensive as hell.