Been playing TVIX for a while now, haven't lost yet. But I'm comfortable holding for extended periods of time, I never buy leveraged tickers on margin and always average down if I feel an upswing is possible.
Just bought 1200@ 7.10 avg. I feel REALLY confident that next week will be way up. If not then I'll wait.
My trouble is that I often sell too early. Profit is indeed profit but pisses me off when I see I could have gotten $4 more....