I think the main point that's been brought out in this thread is that things like prepaid maintenance plans or ESP's are not a "one size fit's all" product. For some people in certain situations, either might be beneficial. For the majority, however, the plans basically benefit those who sell the plans. It's not rocket science and it doesn't require an advanced degree in economics to understand that the folks selling this stuff all make a big profit or they wouldn't bother selling it to you. It's pretty much up to each consumer to evaluate his or her personal situation and decide if the plans make sense for them. Of course, if you don't walk in to the dealership already knowing about this stuff, the sales person will tell you all sorts of BS to get you to sign up right now, with no time to think about it or do any research.
My take is that if the maintenance plan is open ended (not limited to a specific number of services over X number of years), folks who put on a ton of miles will do OK. On the opposite side of the equation, and where the seller's make out like bandits, is the average Harley rider who doesn't put enough miles on a bike in a full year to require a full service. Those are the folks who are paying through the nose just so the few who rack up 30k miles or more a year can get a good deal on maintenance. Anyone in that group should not consider these plans, but instead just find a good shop to handle the work on an as-needed basis. Or better yet, invest in the manual and a few tools and learn to do it yourself. Most of the routine stuff doesn't require any special skills, and you can always let a shop or dealer handle the more involved stuff like fork disassembly or any of those other things that only come up every 25k or 50k miles.
JMHO - Jerry