Hmmm, this is interesting (well to me it is!). I just found this site that shows trends for the number of domains web hosting companies host, and the report for bargainhosts shows a steady stream of people leaving. Not surprising I guess.
The bargainhosts report can be viewed here, while the 1and1 report can be viewed here. This reveals that while people are leaving bargainhosts, more people are joining 1and1. In fact, 1and1 are so big in comparison that they are gaining about 1000 domains every week, while bargainhosts only host 1000 domains in total!