Another problem with eBay - for me - is that people (people who buy things from that site and send them to me to repair to good condition - with the intention of subsequently flipping those things for a profit) are asking me to
[1] do work at some sort of perceived "wholesale" rate (when the demand for my work - at "whatever" rate I might choose to charge - always exceeds my ability to deliver my services), and they are also asking me to
[2] compete with myself.
Yet another problem with eBay are those who send me auction links to misc. instruments along with the vague question, "What about this one, bloke?"
note:
If you're a repeat repair customer of mine, you're none of the above.