I have this same problem as my sister loves all those kinds of shows, particularly the older seasons can be a real struggle to find.
I'm have only ever really used torrents before and was struggling to find a lot of things or like you say they stall out or only have random episodes and not complete seasons that are still being shared.
I have had the most luck with looking into and getting onto newsgroups to find this kind of thing. I have been using geeknzb and have found a lot of things there that I hadn't been able to even find dead torrents of so would recommend looking into that for some things.
That other thing I have had luck with but is very time consuming is dailymotion. There are a lot of full episodes of the older reality stuff on there. The search function is dog shit and you'll need to scroll through a lot of irrelevant results and repeat episodes trying to find a full season of things but when desperate I will go there and using a generic downloaded I found just by searching, painstakingly go through, find the episodes and then plug the links into the download site.
The quality can be quite questionable and if you want subtitles you'll probably be out of luck but my sister will watch 240p and be quite happy with it so doesn't really care.
Good luck, reality TV fucking sucks to find xD