Letters Asking to Buy My Glider

I have received several letters over the last year from people
interested in purchasing my glider. I was wondering if this is common
or rare? I'd like to think it rare and that I own a highly desireable
and marketable glider.

I also wonder if it is some type of scam. The letter's content and
other small detals makes them seem like genuine enquiries.

I always reply back to the author with a nicely worded, "Thanks but no
thanks. I'll contact you if I change my mind." Often I get back a
response which clearly is from a glider pilot.

What is your experience?

John "67R"