Do alot of people buy custom computer cases is it a big market?
 

I was thinking of designing cases and selling them myself. I looked on ebay not many buyers for cases. Alienware cases get bid on a lot though.

That market has definitely grown tremendously over the past 5 years, there is a demand for that product type. I'm not sure how much luck you'd have on eBay though, from what I've seen most people usually purchase premodified cases from small retail shops or directly from the manufacturer over the Internet.

They don't get alot of bids because there is so many. Most are cheap too, around $20-$50. I usualy get mine from tigerdirect.com when building custom pc's