Someone said that books are like flowers. You go to your local florist (well, you can send to Tibet and buy them Interflora at ten times the price, while they'll actually be sent from Barnsley!) to get your missus a bunch of roses, the florist wraps them up, you take them home and she says how lovely they are.
Your missus is interested only in the flowers. She doesn't want to know who grew them, which tree the wrapping paper came from, what the florist's aunt had for lunch. And when you buy the flowers, you don't want all the guff written on the receipt. You just want your missus to enjoy the flowers.
Modern readers have changed--they don't want to plow through 1,000 pages of Kafka to read about someone lighting a cigarette when Agatha Christie does it in one line. They don't need to know where the cigarette came from, or how much gas is used to light it.
They want it quick--this is why we have these tablet things, though I am yet to succumb to reading my favourite book from a chunk of plastic. They also want it at a price they can afford because we're in the middle of a recession. When you buy your missus that bunch of flowers, do you buy her the nice pink ones at £5? Or do you buy her the multi-coloured, scentless ones that she'll not like any more for £25? The cheaper bunch does just as well!
In conclusion, the man who sells oranges at 20 pence each is going to sell more that the one selling them at 50 pence. And he doesn't have to shout from the rooftops for the customers to buy, or insult the ones who don't--they have enough sense to know what they want!
The customer is always right, and this reflects on sales.
I don't care what anyone who doesn't buy them thinks about my books, all I care about are those who do buy them. They are called fans, and they are loved. Those who have no fans and do not sell many books will always say that the ones who do have fans don't have any and that they are failures, but they never ask themselves why they themselves are non-achievers. It's call sour grapes.