If you place your buy order at say 0.0014 or less then if if was to get filled you just got x amount of BitUSD for roughly 81 cents each. you then take your BitUSD send it to Blocktrades and they will send you 0.00155 BTC (roughly 90 cents each) for each BitUSD - that's a 10% profit at least and you could have the output straight back to PoloniEX if thats what you wanted to do.. Polo changes .15 BitUSD per transaction so make sure you only attempt with more than 1.5 BitUSD or you are going backwards.
Alternatively you could send it to your Bitshares Wallet and trade it for BTS for example
Current price of BTS:BitUSD on the DEX is 176BTC/1 BitUSD ~ 0.00000980 sats (same as polo) but you have a 19% discount at least so you are paying esentially 0.00000793 BTC per BTS
I really like this idea of buying BitUSD then using it to get some discounted BTS. Combined with a buy-the-rumor / sell-the-news combo play on the BTS Peerplay run up to September, could be quite a profitable move. Thanks for the insights; you've got yourself another follower!