I should imagine it costs a hell of a lot of money to catch them, process them and deport them, and the guys are seemingly willing to work and whatnot. You're still getting money off them via indirect taxation, and they make a pittance, so it's not really terrible for the economy either. I wouldn't really mind the immigration services turning a blind eye to such people; the real problem (in Britain at least) is those that come here specifically for our benefits system, sometimes under the guise of seeking asylum. They're the scum that need turfing out (along with the British citizens that just scrounge off the benefits), not people like these.