The real question is would you buy an overpriced second hand bike?
As thats what many demo bikes are. I'm fastidious with early oil changes and worry too about have the initial oil changes actually been done on time at least if at all or just once the demo group gang bang session has ended.
Modern bikes are very good but i tend to keep things for a long time so would rather run in myself than get a mediocre discount.
The stealerships complain about margins and overheads etc but a demo bike is cost effective advertising, what would direct marketing to potential customers cost.
Every great cause begins as a movement, becomes a business, and eventually degenerates into a racket - Eric Hoffer
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