Trouble seems to follow you around.
You got some great deals from 80sFREAK, a reconditioned FDS console for around $30 wasn't it? I find it misleading how you've been throwing around the term "$300 worth of Famicom goods", what are you trying to imply with this statement? It seems to me you know exactly what you are doing and word things very carefully, but unfortunately for you 99% of us can read between the lines.
The issue with the RAM adapter was a rare factory fault where certain adapters fitted with a specific brand of memory chip may suffer issues with a small handful of games. By your reasoning, I should be seeking refunds from any seller whom I've purchased a Game Gear from due to the shitty screen or failing caps.
Re PayPal, you DO NOT have to request a refund of the full amount, what a crock of shit. You can request a partial refund and you can choose whether to be refunded on purchase cost or shipping cost or both etc.
I have no more time for you, I won't be welcoming you back to any forum I see you on. You can change your profile name as many times as you like but you can't change the person that you are. I have to go save my cat from gypsies now, see ya...