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Bob SI have experience trading on the CME and MERC, and I think that the key reason NOT to chase these cardboard prices is LIQUIDITY. Heck, it's tough enough to get your camel (let's say 10 big cars) through the keyhole at the financial exchanges. Trying to liquidate cardboard with no organized exchanges is just like playing the game in "Lost Wages" (imo)
Just one old goats' opinion, but for you young newbie bucks, just be careful. (Stepping of my soapbox, now...LOL )
For me, I bid low for collectibles, and if I get 1 out of 50, I'm happy. 
More work....yes....but I like to sleep well at night.
There are predators out there....my advice is don't feed them. Instead stand in their shadows, and pick up the crumbs.