This has been common practice at the Welsh Beer Festival for many years. Where there may be a selection of 50+ beers & 10+ ciders/perrys, the tokem scheme (as noted above) means that there isonly one till handling cash.
The tokens themselves are printed professionally on A4 perforated paper. Whilst the tokens can all be separated and used as 'coins', the A4 sheet is designed to just tear off what is required. An example would be to an A4 sheet perforated as a 5*5 block with each column containing vouchers at 50p, 20p, & 3*10p. Five of these columns makes a page worth £5, and for any purchase you rip offa number of columns (equal to thenumber of whole pounds) and odd tickets tomake up the balance.
Whilst unused tokens can be cashed in (or used in future years) the festival also has a charity collection point for odd unused tokens near the exit, which allows people to avoid queueing at the till (for a refund), while knowing that the festival is not profiteering with the value ofunused tickets.