1) It is not a fail, as I am not claiming to solve all issues or gurantee that you will get on with the saddle. It's also not a win-win as not even covering costs from rentals alone, yes saddle will be sold at RRP minus rental cost.
2) This is correct, and only a costly bike fit can truly sort out underlying issues. Often at a bike fit, you are given a saddle, seems comfortable for 5 mins in the studio and a static trainer and then you try it for a month and its rubbish. This offers you the chance to take it out on the road and reallt test the saddle. Most people know their saddle height and have a comfortable reach but it is their saddle that gives them issues.
3) When you go with a certain brand you are then given to credit to spend only with that brand if you return saddle, I offer many brands and models of brands.