It's a stupid rule. No offence to people who mmm ate the rule.
Some parts are now like Hens teeth, and if someone was getting rid of a spares car if parts from.a shed, and didn't want to brave the eBay of idiots, they might just dump them instead of offering them.up.here.
But there's always the test zone.
I disagree, you have to consider that if a trade goes wrong, everyone looks at the admins for help. As the admins give up time and money to provide this facility for us to use for free, I don't object to any rules they wish to impose. If I do object, I know where the door is.
If people do have rare parts to sell and can't list on here, post them on eBay. If they are in demand, they'll probably get linked here anyway. Also if that sale goes wrong, you've got instant recourse through eBay and OOF doesn't get the bad reputation.
EDIT
I've sold Omega parts on eBay before, I just add a line at the bottom, 'OOF contact me'. It means nothing to most people, but if an OOF member wants the part, they get a discount.
I've found this site extremely useful and in the past have offered to stick some coins in the meter to keep the lights on. It was politely refused.