It doesn't go for cheap either. If you search with the keyword "Brass" on the whats already sold section, you will see that it has generally been selling for big $. A recent sale of howitzer brass here in Shilo saw about $11 a shell....not a bad price until you consider that you had to buy 2144 of them. The small arms brass has also been going for a fair price. Lots of around 6000 kg usually sell for around $30,000, or about $5 a kg.
Mind you, if someone were looking to reload 50 cal on a commercial level, this could be a good source of brass located domestically. Of course, once someone does this, and lots of IVI marked 50 starts hitting the Cdn market, who wants to bet that future lots will be crushed first?