Cam,
I guess the flipside of that is branding. People know Trust is good. When you sell your car and you say it's got Trust this and Apexi that, people know it's good stuff. I'm not saying that Uncle Sam's gears are any less good but at the end of the day, if people don't recognise the brand, they'd be tempted to choose the known brand over the unknown. That branding comes at a cost however and in car bits it's no different to clothing/shops/companies and practically everything else.
On top of all that, there's the old adage which car modifiers everywhere can't escape: -
Rice, rice baby!
Personally, I like the blue gears as they match my Trust I/C boost piping!
Cheers!