I posted this on the Steam trade thread, but this should help anyone if they want to organize an Amazon THQ group buy themselves...
To help anyone planning to do a group buy for the Amazon THQ Pack, you should have no trouble selling MX vs. ATV Reflex and Titan Quest Gold. SR2 and Homefront should be able to be sold as well, but generally all of these are pretty low priced items due to them being THQ things (we're talking $1-$3 mostly with MX closer to $4-$5) so you won't be that far ahead. Some items can't be sold at all which makes some items sorta worthless.
That said, I am not planning to do another at this time as the time invested is high to keep a handle on about 8+ buyers due to the higher cost of the bundle ($20) and "making" money is very low so good luck for anyone planning to bother.
That said, I really wasn't that strict on the pricing and took what most people were what I called "VERY HAPPY" to pay (first offer pretty much so some did offer more later). I also didn't assume the CoH: ToV nor DoW: Gold had a Steam key since Tony said it didn't have one.