yankee - money back with one winner 9/4 or better

?

No, but try googling it. Sounds a reaonable offer if it exists, you could just pick 4 un-named second favs- should get at least one winning. lol

not as good a bet as the lucky 15 with 3x odds one winner, let alone 4x odds.

That does sound better - if you like multiples.

Why do the books make these offers ? Think about that.

Because the bets are traditionally profitable as a whole, but on a case by case basis can be manuipulated for (sometimes extremely significant) advantage to the punter. Especially with BOG on horses.

Walked into Caddy Coward, asked for 5 £5 L15s,5 selections at shops concesions of,
3x 1Wnr,
25% bonus 4 winners
and early prices.
Was offered
2x 1 Wnr
10% bonus
SP only.

You are almost as likely to pick 2 winners using lucky 15.Unfortunately no bookie seems to pay a bonus for this.