We seem to be edging back towards that old chestnut of " He charges £100 for a Disco, therefore he's a cowboy!" This is a ridiculous statement to make - without taking into account the reasons why! The guy may be a part-timer with a love for music, that has a regular steady main income, but likes to do the odd disco for a bit of fun! He may just be starting up, have all the gear, tick all the legality boxes,but undercutting the established DJs to get a foothold in the market.
He may be an established DJ with a lack of sales ability to attract the sort of fee that he really deserves, and unaware of what the local market will wear.
Cowboys should never be labelled by what they charge, but by what they do( or don't do!)