This is where an association w/ a verified code of ethics would benefit both buyer & seller. A clear definition of what is being sold, what exactly the warranty (if any) would cover, etc.
I've been asking my client base this question since this thread began. It's interesting in the fact that if the customer was never burned on a purchase, then paying a premium for a used lift doesn't interest them- cheapest price wins. But, if they've been burned- paying a premium is- in their words "cheap insurance".
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