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that Humble bundle is $4.22, each TF2 key is about 1.9$, so 3.8$ < 4.22$ if someone could do that trade he not only wont be getting any profit but he will be losing money.
Why am I telling you this? because of this: http://www.steamtrades.com/trade/BzjCT/humble-bundles-and-credit-card-fraud People trading it for 2 keys are getting it with credit card fraud, maybe you werent aware of that.
Now you can do as you wish, free bump anyway, but at least I warned you about scammers