That is pretty terrible comparison imo, since when do shirts advertise with the year they were made as a big selling point? When you buy bindings most sites actually include in the main listing title the name and year, Ie. "Union Force's 2010/2011"....when I go looking at shirts does it advertise the year? No, it looks like "DC Star T-Shirt". There is no change in tech on a t-shirt; however, when it comes to gear, just like any sport, year of production and the original target audience(low end, mid, high end user) matter alot.
Alright substitute something else in instead of shirts or just compare computers with bindings. The point I was trying to make is that different products have different rates of improvement over the same time period and I was trying to figure out that rate is for bindings. Year to year there can be no difference in a product or minor tweaks and there is just a rebranding for marketing purposes.