The biggest risk, and it's a HUGE one, is that you don't get the...

The biggest risk, and it's a HUGE one, is that you don't get the buffer of "unrealised" losses that you get from normal equities trading/investing.

So you're constantly at risk of being margin-called. You'd be a genius if you always get the short term trend right, but long term trend is easier to get. However, you'd have to deal with daily fluctuations that could mean suffering unrealised losses in the short term. With CFDs, they crystalise the losses each day and will close your position if not enough funds in account. That's VERY risky IMO.