I have an attack idea.
1] Select a market,
1a] for example lets choose BitBTC,
1b] for consistency let's refer to the market price as units of "Bitshares per Bitcoin" ie (BS/BTC) ,
1c] lets assume the Last traded market price was 500 Bitshares for each Bitcoin, or '500',
2] Place a huge Bid of the amount equal to all current Ask orders,
2a] let's imagine this costs a total of "Z bitshares",
2b] I am now betting that the value (BS/BTC) will go up, ie that a Bitcoin will be worth more than 500 Bitshares,
3] Place a new Ask order at a much higher price,
4] Place a new Bid order at this exact price, (this tricks BitSharesX into believing that the price has gone way, way up, say from 500 to 1000),
5] Force shorts to close out your position (as BitSharesX forces them to cover), by selling to you (at twice what you just paid).
Can even rinse-and-repeat this strategy with higher and higher prices.
Market depth makes this attack costlier, but simultaneously, more profitable, so a different type of solution may be required.