Why don't Prostitutes take credit / Debitcards?
ok we know the street girl won't be able to but surely registered with HMRC escorts who run a proper registered business (Or Claim to) would want to take credit cards, after all it is guaranteed payment, money straight into the bank, reduces the chance of having money stolen etc.
Some agencies and parlours may take cards but in the main it has to be CASH, in 2011 most businesses actually prefer alternatives to cash (debit / credit card) as cash is high risk on insurance and banking charges when the cash is banked (that's why supermarkets offer cash back)
So Legit businesses take cards, the guys that wash cars don't a lot of builders, gardeners, cleaners don't, unlicensed minicabs don't.
The only logic for a prostitute not taking cards appears to be the non declare of the income, be this in relation to HMRC, Benefits, housing etc.