I think these domains can be great, but since they are only 2 characters they can lack meaning, which is why I think they are difficult to find uses for. I know you guys talk about the difference between reseller and end user values, but at the end of the day, the end user worth is all that matters, no? So, a domain like a1.ca would be worth a lot because business use this term. But what can a domain like y2.ca be used for? Without a good use, I just don't see the value.
My 2 cents!