AC/DC Premium seems to sell for... a Premium here in Canada. The Pro pices seem at least approximately in line with what people are quoting for US Sales, but $6900 for ACDC Premium seems a bit steep (when you take into account 12% tax).
Is it worth it? Its up to you. Even after pinflation ~8K will buy you almost any used game out there, or more likely 3-4 used games.
Maybe I just have not been quoted the "best price out there". But the cost of a NIB AC/DC premium seems steeeeep to me. Let there be fat ass bankrolls