bitUSD can be purchased for very close to a dollar. The margin requirements only apply to “creating” bitUSD.
For example; yesterday I put 1200 bts up for collateral and borrowed 300 bitUSD, then I bought 300$ worth of bts and immediately put in a slightly higher sell order, and 1 hr later, I closed every thing out and now I have 1230 bts. I’m new to Bitshares and wanted to see for myself how it works.