Price is irrelevant if there is no liquidity and volume. Right now if someone wanted to cash out a lot of BitUSD, they'd have to convert it to BTS, then BTC, then real USD. There's barely 100BTC on the buy side on Polo (haven't checked BTC38, but I doubt it's that different).
Whoever wanted to buy "cheap" has already bought. There's just no support in sight, all the hype is gone. It's just this community playing musical chairs until some serious (and successful) marketing effort is made.