Retail only allows 2x - 4x margin and depending on if you have 25k or more you will only be allowed a few trades a week due to SEC rule if you are trading US stocks. With a new trader its very easy to try higher shares size with 10x margin or 20x margin with a $5000 account like most of these props allow. I'm not talking about a prop where you are working for someone else. The one that I have is where you trade there account but P/L comes out of my sub account. I have to say I would never have a high priced retail account I like my prop its the best prices I have ever found.