It can be a very expensive hobby as three gents found out recently.
Abdullah, of Fishponds Road, was ordered to pay a £660 fine, a £66 victim surcharge and £85 in prosecution costs - a total of £811.
Dudden, from Calne in Wiltshire, was found guilty and ordered to pay £811.
Ivanov, was ordered to pay £1,104, which breaks down to a £440 fine, a £44 victim surcharge and prosecution costs of £620.