They have no council tax, electric bill, gas bill, water rates, mortgage or rent to pay. They don't pay for clearing up when they move on.
They do have to pay for diesel (probably), road tax and insurance for their trucks (possibly).
They recycle scrap from households and copper wire, aluminium etc. from other places.
They buy and sell horses within their community and make large bets on the outcome of trotting races and bare knuckle fights.
Not had one round selling pegs or lucky white heather for a while.