Im not particularly interested in the whole gaming case look if you know what i mean i like my plain glossy black case and the most i suaully spend on a case is £40 whiche even if you sold it to me at cost price would be well over that
butheres ways IMO i think you will/could make your money from this
one good thing to offer would be to offer clients the ability to be able to design their own case and offer custom/unique paint jobs
also make a few cases and computers and take them to computer shows , and lan parties to show them off and give the cases some exposure to people who would really be interested in your product
also if you have computer shops locally/ i mean smaller independant or regional companies ,ask to speak to someone in charge and ask them if they would be interested in selling your cases or offering your cutom design services to ther own customers
Or even cooler would be to set up a concession in a local computer store and sell your product from there but you would have to be pretty good to do that