They opened in Gharafa while back, but now they sell bikes. as for why rents are crazy high and there aren't enough PC enthusiasts to move the market of high end or any good quality PC parts actually. Most people relay on laptops or premade cheap PCs, companies, banks and the government rely on contractors to provide PCs. And finally most PC enthusiasts order their parts and ship it because its still cheaper than buying here.
As for the alternative. truth is I don't think there are any at Tornado's level. there are couple of shops still surviving at Sufitale (spelling) building, and according to the workers they're going to close too.