Hiya purity,
Probably the main reason for selling up in the U.K. is probably down to the British winters.
If it was a month or 2 duration i think most w/c who have got out would have stuck with it, as window cleaning in the summer is really pleasant.
When you 'lose' your hands on a daily basis for about 4 or 5 months, the job becomes less pleasant, the job also becomes a lot more dangerous as well!
Many W/c over here try the trade, then hit the winter, then try to sell their round to a more hardened individual once they experience the effects of the cold!
Paul
P.s. what do you charge for a detached 3 bed house over there?