It's also the way they collect it - rude, threatening and when their system messes up, no apology or explanation.
Way back in the nineties, before I gave in to cable, I had 6 years of snow on the telly - the ariel was kaput when I moved in, the LL was not of the fixy persuasion, so channels 1-5 only, and snowy white noise. I could just about watch videos (yes, videos), but it was like watching it through a veil. Yet, because I had a knackered little colour TV, I had to pay, whether I could recieve it or no. (DD1 was going through the 'Let's watch Mary Poppins 6 times a day' phase)
So I dutifully paid, by the Cash Easy Entry scheme, t'was supposed to be about £3.82 a fortnight, but I like to round things up, so I would pay £4, therefore I was actually ahead. But every now and then, their system would spit out a threatening letter, saying I was 50p overdue (yet the letter was dated a day before it was allegedly due), and it was threatening me with all sorts. I called them, politely asked what was going on as I had all my reciepts around me and that I was actually quite ahead, not behind, and she was rude, no apology, all I could get was a begrudging "yes, you are ahead and owe us nothing".
Since becoming a Real Person Who Pays By DD, in the old flat, every now and then they'd send a snotty letter threatening the occupiers of Flat X.
"But there is no Flat X, only Y and Z" I would say,
telling them that Z paid CEE and I was DD, and they'd say
"Well that's not what the post office have told us".
I'd tell them that it had been only Y and Z for about 50 years and that they were scaring the occupier of Z with all their threats, that they have a disability and that the stress was making them worse.
I also (after phoning them about it for about the tenth time) told them that I'd knock a hole in the ceiling just to check that someone hadn't sneaked and extra floor into the two-storey building one night while we weren't looking.
Eventually they agreed that No, there isn't a flat X, and to ignore any further letters and threats. Which were still coming thick and fast when we moved out.
The moral of this rather long and tedious tale is...
If you are going to make a blanket charge, please implement it properly, fairly, and with manners.
If someone takes issue with a product you make, look into it, with manners.
Don't threaten, scare, harass, patronise or consescend just because you KNOW your 'customers' can't go elsewhere.