I see a few ebay seller with max feedback (hundred thousand something). They have more than ten thousand items on their ebay store. Then I check their items, almost 99% items come from amazon, but their price on ebay is a little higher. They still gain profit for each item after ebay and paypal fee is around from $0.25 to $1 or $2 whatever .
How come they can manage all of ten thousand items ?
If amazon change the price, how do they know and change it in their ebay price?
Is there any software or app for this?