Maybe, but the material needed for multiple bachelors' degrees is vast.

I suppose if you took (essentially) the same courses at four different universities simultaneously, you could get four for the "price" of one. And I mean only the intellectual price, not the actual price, which would be huge and pointless.

It depends. If there's a large relationship between the degrees, then a lot of the classes you're taking are going to be similar (or the same class), and you only have to do the liberal arts and entry level stuff once.