It used to be a good way to sell things but then so many people starting using them. If you want stuff to sell you have to make the prices very reasonable in comparison to everyone eles'.
Not good. I gave up selling on Ebay because you need a credit card for that. You can buy from Ebay without a credit card though. If you sell on Ebay you have to have hi postage charge or else you lose money. Don't know about Amazon
Might as well walk down dark alleys in the city all night with your wallet open.
Experiences are both as good & bad as the people you sell to ....check their buying feedback if they are new or have little positive scores they might rip you off,,,,you are not allowed to leave negative feedback on buyers any more a small minority take advantage so be careful & use recorded mail on expensive items.....before you list anything do plenty of research see what others are selling the same item for :-)