I've never really thought about rules per se but I've done some trades in the past. The only one I can remember at the moment was a speaker trade. I traded a pair of Alon Lotus SE's for a pair of JMlabs Micro-Utopias following a move to my current smaller quarters. It was a local deal so we were able to inspect each others speakers and that was that.
Your rules seem reasonable and make common sense if one is actively pursuing trades.
Your rules seem reasonable and make common sense if one is actively pursuing trades.