great points - I totally know this. it's very helpful to hear. but... we've been growing so fast i haven't yet had a chance yet to raise them, and i'm paying the price of a fixed bid prjoject we took that was underpriced by about 50%. yet i don't regret the fixed bid because it helped us launch and we now have a killer client project to show for it.
Doing fixed-bid is another interesting angle I didn't cover; thanks for bringing it up!
It's yet another potential source of both great profitability (when you do something THEY think is hard in just 10 hours) or loss (as what you described).