You don't say what trim level or accessories the 2001 Scamp16 has or what condition it is in.
While that sounds a bit high it is not outside the parameters of a fair price.
will hold its value remarkably well, It is not uncommon for a thirty year old Scamp13 to draw more than $6000.
You should price a new one, comparably equipped,and decide for yourself.
I just bought a 22 year old Mustang after driving a new one. I have no doubt that my money is safer in the 1995 which will actually appreciate over time. Of course that will depend on condition, trim level, and desirable accessories.