The most prevalent issue I've come across is bone-idle promoters. That's the guy who expects your band to promote his gig (I'm fine with that in itself), but then he does virtually nothing about it himself. C'mon, the clue is in your job title, "promoter"! Get out there and "promote". Do I turn up to your gig, hand you my Tele and ask you to play my songs for me? Exactly! I used to set up and promote gigs for a while and I would work my arse off promoting them: fliers in pubs, posters in every shop window, social media, newspaper ads, magazine gig listings, word of mouth, street-teams, everything! And these days most of these 'promoters' can't be bothered to get up off their armchair. It makes my p155 boil. Can you tell?