@yvv what are you talking about mate? I think you confuse bitshares DEX purpose... Every bitasset created in bitshares is backed up by min 2.5 collateral value in bitshares. This is why in bitshares if you want to short sell you need to place at least 2.5 collateral value. This is why bitshares is safe and will avoid bankrupt. Because every bitasset created is backed up by 2.5 times collateral value!! This is why bitshares is superior to any bank and to any centralized exchange..Because you know that the " Bank" actually holds a lot of collateral for your "Money"...This is not a flaw in bitshares!! This is the superior market selling point of bitshares!!
Especially now that we have more than $1 mil in bitassets is bitusd and bitcny and we all know that for these bitassets the blockchain holds at least x2.5 collateral in bts value, THAT is the selling point of bitshares. I know that now I feel very comfortable keeping my bitusd in bitshares Dex. What we need to do now is just do the same for biteur, bitgbp, bitgold, bitsilver, bitbtc and reduce the premium paid for those bitassets as well and be close to peg as bitusd and bitcny are currently are...
Bitshares DEX is supposed to be your own bank. Not your own trading house! I want to feel safe keeping bitassets. I do not want bitshares blockchain to keep fractional reserves so you can margin trade with leverage!! The people who designed bts knew exactly what they were doing!!
Going back to margin trading of centralized exchanges that you mentioned...All exchanges that give leverage are supposed to keep balanced books, take opposite positions to hedge and keep only the spreads charged. Well I have news for you..Most of them don't do that! Not even very big regulated exchanges that offer leverage to their customers. This is why when the CHF - EUR peg broke a couple of very big exchanges with margin trading went bankrupt and others almost bankrupt..
I hope that you do know that most banks just keep only fractional reserves of peoples money right? Well I want bitshares to be exactly what it is..A bank that keeps more than 250% of collateral of peoples money!
As a final note, I hope you do not learn the hard way about margin trading in Poloniex as I did when I lost 80% of my bts holdings when I used them to margin trade (going long of course)..Poloniex and all these exchanges most probably manipulate prices in their favor. They see all the order books and they have really sophisticated bots to drive margin calls and screw you in their favor. So be careful when margin trading in Poloniex. They can screw you even if you are in the right direction of the trade..For example after too obvious pumps you go short and all of the sudden their servers don't work until prices recover and you do not get your entitled profit, or get margin called when you wanted to close your position etc etc..