Of course!
I feel that the appearance of a system winds up being a huge factor for all of us. My DIY gear doesn't look great, and it gripes me. I wanted a glossy red, home depot gave me a glossy orange

At least the Orions turned out okay. If two systems sound the same, I'm probably going to have a better 'experience' with the better/cooler looking one.
In terms of the cost, personally I would pay $100-$250 for a case upgrade, but no more. For anything more than that, I'm fine with a sheet metal case. I also think it depends on the gear. For a $3000 amp, I would more willingly pay $250 to make it look nicer. For a $250 amp, no way am I paying $250 for a case. So in sum, for 1.8x, I would personally pass. (Then again, I have orange MDF boxes in my system....

)
-West