Pro vs. joe.
The uniforms/jerseys that are issued or designed for the teams are very rarely available to the public. Take a look at NFL jerseys. The off the rack jersey is no where near the NFL Sunday jersey. The custom "sewn on" jerseys are a lot more expensive, yet close to the real deal. The teams normally have jerseys for hot weather, custom fits for body type, or position, ie: running backs have tight fit to avoid pull down tackles. That can be applied to cycling as well. Take a look at Trek's Disco section. They have a few different jerseys for different conditions. The more specific, the more expensive. I doubt many will pay the huge $$ for the Spin Swift TT suit, in Disco colors no less, so why make many? My point being, more people will buy a cheaper, casual replica jersey/shorts, than the team issue stuff.