Pros
-easy to start and list items
-cheaper shipping than retail
-high demand items sell quick
-make extra income
Cons
-customers / buyers that put in Cart but never buy. eBay does not survive on window shoppers and neither do I
-low demand items can wait for years
-need a ton of inventory, but high demand as possible, otherwise you will probably fail like me
-buyer fraud - trying to get your items for free
-competition where some sellers have items selling way under what you are selling for and they do not seem to care about profit at all based on how low the price is (ie: books)
-buyers don't leave feedback especially if you are new, so it makes it really hard to get going
-scammers but not a whole lot, definitely if you're new tho