I suspect as long as birds want handbags, perfume and dresses then there'll be incognito ways of paying for them, like gift vouchers, just more electronic.
Remember Cynthia Payne and her Luncheon Vouchers?
IIRC, the luncheon voucher system was so that no money had changed hands, therefore her gaff (where she actually held all the parties) couldn't be considered a brothel, and therefore illegal. It wasn't to do with tax.
...although maybe it
was the tax dodging they eventually got her on, just like Al Capone?
Also worth noting that
Horizontal Pleasures of this very Parish used to frequent her parties