I would though say that the way people record "roll ups" always seems to be a little disingenuous and that people aren't really being truthful with themselves. For me if you have 1pt on a 3/1 winner in a double with say constitution hill at 6/4 then you have put 4 points on Constitution Hill at 6/4, not 1 point at 9/1. If I could back said 3/1 winner at 4/1 with a different bookmaker and get 13/8 on Constitution Hill with a third bookmaker then why would I not do a single on 4/1 and then place any winnings on at 13/8 - it's essentially the same bet and the same decision but you have got better odds. Why would you record one bet as 1pt on Constitution Hill at 9/1 and another as 5pts on Constitution Hill at 13/8 - makes no sense. The funds that we put on any single bet must have come from somewhere - what if I had a 1pt winner last week at 9/1 and then decided today to put it all on Constitution Hill at 6/4, would be a bit mad to record that as 1pt on Constitution Hill at 24/1. Fact is that if you put on a double (or multiple) then unless it's related in some way (e.g. win today and at Festival) then you are nearly always better off putting on a single (to take advantage of different bookmaker odds) and reinvesting the winnings - and if you find it difficult after the first winner to stick multiple points on at 6/4 then perhaps you have been kidding yourself...
I do a lot of roll ups and I agree with this to a point, but it depends on what you're trying to achieve with the roll up.
For me there's two elements to it - the first is that I bet every weekend anyway so the challenge of seeing how good my 'best' bet is on the weekend is quite appealing. However, the financial reward of doing the horses in singles is quite boring to me, so trying to add a Cheltenham horse to it gives me a chance of winning big(ger).
The second point is what would your second outlay be. I know we don't normally do monetary stakes here but I'll use them to illustrate the point here. Last year, my
only successful roll up, was 16/1 Clan Legend at Aintree in December with 10/1 Flooring Porter Stayers. That's probably a sad indictment of my ability to pick winners every weekend last year, but was actually put up on here in advance of the race (post 113 of my diary last year) so is a real life example. Let's say a given person's 1pt stake is a fiver. To get the same return on FP as the double, you'd have to put nearly ?100 on in a single - does anyone really think that's not gonna attract suspicion if you're typically a fiver better? Obviously that scales up as well - a tenner would require best part of ?200 etc. In those longer priced ones, there could be a real benefit if you have an edge but you know you're gonna lose more than you win so it depends on what you're trying to achieve.
This year, I've done a lot more shorter priced horses around the evens mark and I'm starting to come to the conclusion that they probably aren't worth the roll ups in the same way I thought unless you're really selective with them as, even though the strike rate is a bit better, you probably do lose more money than you gain and are probably better off just doing an ew single at e.g 33/1, because you obviously don't get the ew angle when you do a roll up. So I've started pivoting towards that method more in the last month - I'll know more about how that turns out after this festival.
The point about being disingenuous with stakes is heavily dependent on whether you think it matters that you've lost 5 points on a specific horse (e.g. Constitution Hill) or you've just lost 5 points. For me, I'm more bothered about how many points I've lost, not necessarily where I've lost them if I've got my appropriate return on a horse. I'm not convinced that's the best way of thinking, but it's where I'm at atm.