I've been lurking here for a while and also I've taken arbitrage courses for techniques etc. To create sort of my own as well as talk to friends who've made a living from eBay for 10-15 years. I've only started around 3-4 months ago I'm doing moderately ok. The peer I talk to has his listings up to 2m a year cap and makes around 700-800k in sales a year from arbitrage alone. He won't disclose his profit but its enough to do it full time he said. Heres mine so far So far I've done alright but I'm running into some problems 1) Amazon Trolls and hackers: they have around 10-20 5 star reviews but never send the package or lie about the shape the package is in 2) Legit Companys who do false advertising: Example: I flipped an HP server and made around 3-400 dollars per server when they arrived to the buyer they were the wrong model number as well as the item wasn't new and factory sealed. It was refurbished and used. It was listed on Amazon Prime as New. This backed me up completely and Now I'm refunded 3-4k 3) Paypal random hold: Since I've scaled so quickly and paypal will decide to do a random hold on a lump sum of money for a certain amount of time. I'm on the phone with Ebay and Paypal constantly sometimes to get issues like these resolved. 4) Slow shipping: The shipping process for some buyers takes longer than expected and since you're eBay store can only have so many days out and the Fast & Free gets the most buys unless its Prime its a large risk. I'm currently sitting at 81% on my feedback from two bad reviews due to slow shipping. 5) Ebay Listing Cap: Say you have a couple items that haven't sold squat over the course of 20-30 days but they're big ticket items. If you cancel that request Ebay will still count it against your Seller Limit and you will not be able to Sell again till next month. That's all for now if you guys have any ideas or help with these issues. I'd appreciate it. I'm going to continue doing this but I might have to open up another store due to that bad feedback.