is there a way to set a default value to an attribute?

say every XXXL T-shirt is an extra $2 and every XXXXL T-shirt is an extra $3 for a product where the L, XL, XXL sizes are all $10.

so that if i have 30 Tshirts, and i have the improved attribute controller (which i really likes), all i have to do is add L, XL, XXL, XXXL, XXXXL sizes and due to the default value of the attribute the values in the attribute drop-down are as follows:

Large
XL
XXL
XXXL (+$2)
XXXXL (+$3)

without having to go back and enter the + $2 and +$3 for each Tshirt..

i've searched and unfortunately, i'm thinking this is not the way that things are handled (i do not see a default value for the attributes in the database and the products_attributes table is the only place the attribute values are stored). here's me wishful thinking that i just happened to miss something???