I've a better idea ~ several members of the forum either work or have worked as odds compilers and will have an idea whether such an offer represents a desire to lay the jolly or simply a PR ploy.
I'm stunned by the logic you use. If you don't like a short priced horse, why would you encourage punters to bet against it? The bookie doesn't have a problem with giving a minority of losing punters a free spin because, as losing punters, they're enormously likely to simply give the money back in extra bets. Similarly, without taking a view, said bookie knows that if the jolly is a real 6/4 chance and there are 15 other runners, then there is a 40% chance of having a money back offer they can promote, but only an average of 6-7% of the punters who qualify for that bonus see any return, and the majority of those will squander that meagre reward, so the bookie gets maximum publicity for minimal return.
This offer tends to apply to a certain type of race ~ one where the favourite is not a working man's price but no certainty and there is no clear choice against it. That way punters will be convinced to bet money they may otherwise have kept in their pockets but will tend to bet over a wide selection of runners, virtually guaranteeing a decent profit with the possibility of a PR opportunity thrown in.
Paddy Power are brilliant at promoting themselves in such a way, but to credit them with the intelligence to take a view in such a way is laughable. The only maths they do is to maximise the chance of promoting these money back specials while managing to give back as little as possible. That's good marketing.
BTW ~ this isn't just random opinion and as someone who works in a trading environment and who previously did the same in a marketing capacity for Ladbrokes, I can assure you it's simple fact.
My comment in my first post are based on my observations over some time and not just on this thread or this forum. You are very precious about your opinions which are often left field and sometimes of some interest, but often simply flawed. When you get no response or a negative response you always take it as if it's a personal affront to you (note the clique thread). Newsflash ~ it's not all about you and if you weren't so defensive then you might garner a little bit more support, not least from me.