After giving it some thought, I am leaning to the side that says armor set prices will not go up drastically with the inclusion of foot guards. I say this because I think the price of armor sets is dependent less on the pieces of armor that are required for a full set, and more dependent on the perceived value of having a specific level of protection.
On the other hand those who are stuck piece-mealing as set together (like me

) will be harder hit, as there is now another piece to track down and buy or find a reasonably well suited stand in.
So I guess what I am saying is that it will be an even trade off, and noone really even knows yet.
I apologize for starting the conversation in you sales post, btw. I didn't mean to steer it of it's intended course.