i am pretty sure that margin trading must be sketchy on other exchanges, because I have been hardcore warned by so many people. However, maybe there's something different with Bitshares DEX since BTS is the native token you borrow USD against, and it's almost always always going up. Margin trading elsewhere seems so serious but I haven't lost that often using it. But I have developed a modest percentage trick that works over 80% of the time and stashes away over 6% profit nearly every iteration.