Why the BBA (broad band adapter) is so expensive:
It orginally sold for $60, and was only availible from sega.com (no retailers carried it).
Sega.com sold out of it
twice! First time I think in less than two days, the second in like a week.
This makes it fairly rare. I pretty sure sega limited how many you could buy as well, meaning no one got to 'stock up' on them.
And lastly thier usefullness.
What it's usefull for:
For official stuff, not much, only POD, Quake 3, Planetweb browser 3.0, and another DC game I can't remember the name of used it.
Now for unofficial (i.e. homebrew) stuff it becomes fairly usefull.
Linux and NetBSD for Dreamcast can mount NSF volumes using it, and pretty much everything else those two OSes can do with a regular NIC. (Someone once setup a web server on NetBSD, and hosted a small site from thier Dreamcast)
If you want to program for the Dreamcast, its very fast in uploading programs for testing. Without a BBA you either have to burn a CDR everytime you want to test your program, or use a coder's cable (serial link to PC) to transfer it at a pokey 115Kbps. If you do alot of testing, the time saved by uploading things at 100Mbps is well worth $100. I bought mine when they first came out at $60 (within an hour of the launch) for this purpose.
And you can copy games using this, much faster than the coder's cable 115Kbps speed.
Oh yeah, most games aren't 'ripped down' (ie removing intros, music, etc), most games will fit on a 700MB CDR without troubles. A GD
can hold 1 gig of data, but most of the time they don't. Only few games (mostly multi-disc games) use a full 1 GB per disc, and for the 'backup' versions they figured out a way to use real-time decompression for it to fit on a regular 700MB CDR.
Someone asked about a Dreamcast Hacking BBS, go to
DC Emulation's forums. Go to the 'Hardware Modification' for hardware stuff (fixing/moding/tech details). Other forums for different software side stuff (ie programming, burning DC emulators). Pretty everything but piracy is availible on thier boards (posts get locked for piracy/warez/how to copy games/etc.)