My reason for starting this thread was to guage how many other consultants offer this service, and how they have found its popularity among their clients.
I'm considering offering marketing services, the payment of them based partly on the success of the marketing, which is another way of looking at "marketing consultant or a similar service, who has actually guaranteed their results."; it's a way of shouldering some of the risk myself rather than a guarantee.
What I'm thinking of is: an initial fixed payment which wouldn't be a full fair amount for the work I'll do. On top of that, payment attached to success of marketing, e.g. percentage of each sale from the marketing. If the marketing is an entire failure, the fixed initial amount would be the full amount I'd get. Semi-successful, I might get roughly the amount I'd have got if I'd charged by the hour. Blinding runaway success, I'd get more than if I'd charged by the hour.
I've been advised by several people not to do this but I keep coming back to it. There's a few things I really like about it; helps people take a punt with me, and, makes me more of a stakeholder therefore more attached to the outcome of the marketing thus having a good effect on the marketing I'd do. The devil would be in the details though. Also good trust between me and my client, both ways, would be necessary. It's something I'm considering for only very local to me small business's at the moment.
Another thing I like about the payment idea is, because my payment isn't attached directly to the time I spend on the work, it'll give me a bit of leeway; e.g. if I think interviewing some people who fit the target market is worthwhile but the client doesn't think it's that worthwhile, seeing as I'm not charging by the hour it wouldn't be such a problem for them. To cut costs often clients cut corners in a way which negatively effects the work. The payment scheme I'm sketching would be a way of getting round that.
Would be interested in any thoughts, opinions, experiences of this type of payment scheme.
Oh yeah, just to add: I wouldn't be offering this blindly as it were, it'd be subject to who/what the client is.
Useful looking book (which I haven't got round to reading myself yet):
http://www.amazon.com/gp/product/0470504544