So does eBay allow sellers to rescind paid/completed transactions w/out consequences?

I have near double digits in dialogue with the other person.

After web based resolutions, I invested over 2 hours with multiple calls to customer service.
He simply decided that the first two (payment complete for 9 days) transactions did not bring him enough money, so he raised the shipping of the third auction for a $5 dollar ashtray to just under $75 for shipping from Maine (to make up profit) -eBay really didn't seem to concerned about the shipping hike. One of the other items, an M-body 4-gauge cluster, was similar in size and shipped for about $15.