In the United States, Community Colleges are often referred to as Roach Motels. They are so called because people who begin attending Community Colleges rarely finsh. Rather, the tendency is for the students to just keep on taking one random course after another for 8-12 years without ever attaining a degree or advancing to a full college. Hence the students never really leave. That is to say, they check in, but they don't check out, as per the old TV ad.
What the English call Townies are the head Roaches of our Roach Motels.
-Man, is Bill still going to Virginia Western?
--Dude, he's been at that Roach Motel since the Eighties. He's banged a lot of thirty-five year old single mother gash but still no degree.
-Oh well, at least they have ash trays there.