l2tradr,
Yes it is possible to net $30k per year, after taxes and expenses, from a $30k account, but not probable. It is possible to create a system, or work someone else's system, to deliver that kind of profit. It has been done. It is being done today. However, systems are slaves to the markets, which means that profit from such systems are slaves to the people who push the buttons to buy and sell, all around the world. All that means is that profitable systems don't last forever. Their effectiveness will disappear in time. Therefore, any system is subject to obsolescence at the whim of the market.
I work multiple ER2 and YM systems. Some days, nothing works for me, and I simply have to close down my platform and go play. I have yet to see a system that works in all markets and conditions, chop and trending.
Yes, it can be done. I have seen it done. But when it doesn't work anymore, a trader worth more than just one system will adapt and create, buy or lease another system that does work, at least for now.
There are brokers with $300 intraday margins for the ES for those who wish to hang themselves with leverage, but I think your friend is wise to trade with a $3,000 per contract margin. Don't get me wrong, I know people who built million-dollar portfolios in one year using such miniscule margins, but I don't think I would have the guts to try that. The idea of watching my entire portfolio go up 60% one day and down 50% the next is just too wrenching for me. But some people are made for that kind of action.
Good trading to your friend.