If I would buy on margin, there would have to be a pretty decent pullback. If the value drops below 20%, you get margin called. That 20% doesn't afford you a ton of wiggle room. I shorted Monero not too long ago. The damn thing was too volitale so I jumped out of it. Lesson learned.
That's true, margin can be really dangerous. However there are ways around some of the dangers. I've been all-in FCT for a month or two now, and recently got bored, moved all my holdings into Margin, and am now using that as leverage to buy more FCT. The key: I only buy about 15% worth of the holdings I've moved into Margin, so will always have more than enough collateral to avoid a margin call. I have to pay the daily fee for borrowing the additional FCT (right now about .009%), but aside from that, I believe FCT will rise sooner or later, so it's really just a matter of doubling down, with the relatively small borrowing fee tacked on. Not recommending this to anyone, just ... FYI.