So there is simply NO POINT adding a sombre, "Please enjoy responsibly," to a radio advert for alcohol. That is so not going to make the listener think, "Dear me, in that case I'd better not go out with my mates and get ratted tonight as planned." Similarly I doubt all the messages on cigarette packets persuade smokers to desist. The thing about nagging is that it's irritating, so people tune it out.
Hi everyone, my thriller The Tattooist is on special offer for 99p!
What starts as just another murder investigation for DI Beverly Richards gradually turns into a nightmare, as a ruthless serial killer known as The Tattooist slays and mutilates lots of attractive young women and a few children and pets too, then tattoos clues on to their skins to taunt the police.
In a unique twist, the killer begins to hunt the cop hunting him! Beverley must find him and stop the slayings before he slaughters her, her twins, and her pet lop-eared rabbit, while simultaneously dealing with a hard-drinking boss who wants her taken off the case. Not to mention unfinished business with a man from her past who may not be what he seems.
Time is running out for Beverley – can she beat her demons and survive a final show-down with The Tattooist?
Perhaps they worked, in the early days of the Kindle; but now, I think there have been so many of these posts, often inappropriately posted on half a dozen threads simultaneously, that potential readers mostly screen them out. On the US Amazon forums, such was the proliferation of Buy my book! posts that Amazon has declared zero tolerance, banning even discreet book links in signatures.
Writers need readers, and won't get them by badgering.