Some of it is the sizing too. They tend to run out, and not re-stock larger sizes. Which is okay, because you can get great shorts and stuff online, or find some place to try on brands that you have not tried before you buy them. I'm not just talking about shorts, jerseys, and arm/leg covers. I've even found that most of the shoes are below size 10 U.S. (European size 44). Most clydes that I know wear size 11 and up (European size 45 and up). You don't have to be a clyde either, to have a problem. Most guys over 6ft 2 inches tall have similar problems with a lot of the LBS gear offerings.
I know that they stock equipment to sell to their most common customer, but it just seems like there is not much gear out there for guys over 5 ft 10 inches, or over 175 lbs. I see lots of bikers out there that don't fall within that range, and we all trade tips on where to buy gear.