I'm sorry, one product IS a blah blah blah tool and the other IS a blee blee blee tool. Some users do in fact need blah blah blah blah and blee blee blee blee at the same time but not everyone needs both, hence two separate products.
Yes, Adobe does make more money on two separate products but that's not necessarily the reason for doing so. I guess Adobe makes more money by not implementing Photoshop features into Dreamweaver as well.
Actually shockwave and flash did the same thing, except at the time shockwave (Director) was actually more full featured with a programming language called Lingo (this was well before actionscript).
Yes, Adobe does make more money on two separate products but that's not necessarily the reason for doing so. I guess Adobe makes more money by not implementing Photoshop features into Dreamweaver as well.