I disagree the Bodega Bay definitely makes an A500 more powerful than an A4000. You just have to specify the use. Let's say for instance as ammunition for a catapult. It would definitely be more powerful since this sucker is freaking heavy!
As a computer though not so much. It really is just a busboard in unique enclosure that lets you keep everything kind of neatly together. Does its job well and there don't seem to be a lot of them floating around.
I'm kind of a Bodega Bay addict. I had one and sold it and bought another. Its a pretty cool expansion for a cpu upgraded A500. It is incredibly bulky though (think old IBM XT) and doesn't sit well on a desk because of that size.
I agree that the only reason to have one is if you like esoteric equipment.