Slackmaster:
No, man, your question's valid. I used to think that my Sansamps were "preamps" and I was telling everybody that. Then I started experimenting with recording and realized that the Bass DI doesn't give me a strong enough signal w/o a real preamp, so basically it's a DI, just like it says. It maybe an active DI, but I don't think it qualifies to be called a "preamp", because it doesn't amplify the signals to line level.
Basically, a Boss EQ pedal, CS-3 compressor and even ZOOM 505 can amplify signal somewhat, but they're hardly preamps. At least in the conventional sense - you still need to preamplify them before recording. They're all designed to be put BEFORE a guitar or bass amp, which have a built-in preamp. Yes, the Bass DI can be sent "directly to board", but most mixers have mic preamps and that's implied.
That's how I see the matter. I'm no authority on this, of course, so it's all just IMHO.
I think it's good that you brought it up. I like the Sansamp units still, but instead of raving about them, like I used to, it's nice to help people see an accurate picture of what they are. It'd be disappointing to get one of those and not get the results you expected. There's definitely a learning curve with them for RECORDING. With live sound - they're a breeze.