I get where you're coming from (I was there, too), but I think you're looking at things in the wrong perspective. Consider this - if someone sells it on a website (Amazon, discogs, etc) for a certain price, that doesn't automatically make it the 'going rate'. I've grabbed things off discogs and amazon that normally go for high prices, but the seller either didn't know what they had, or just wanted to get rid of it and didn't care. I have sold a few things for way lower than they should sell for several times simply because I didn't know what they were worth. Amazon is great for finding obscure things that people are just clearing out with a set price that typically covers all items of the same format (i.e. $2.98 for cassettes, but shipping is $4 each with no combine option, so sellers make extra from that).
Ultimately, no release is worth more than a buyer is willing to pay, but for some things there is always a buyer; it just takes a while to find them.
All that being said, you're coming off as real butt-hurt that you couldn't get this guy to save you an extra 50 cents. 50 CENTS!!! That's probably not even going to cover his paypal fees. Seriously, I don't understand why you don't just order the one you saw for that price (or even buy both, then flip one now that you've cornered the market). Plus, lifesourcerec is one of our own, and is probably a nice guy more than an asshole. It's not like he told you to fuck off or anything - he simply said he'd stick to ebay and go for that $6.
Also, shipping a CD typically costs about $3 (and padded envelopes ain't free, either). Why would he waste package tape, ink, and gas to the post office to give you the CD for free? I'd break a CD in half, take a shit on it, and throw it away before I waste precious shipping materials and add wear & tear on my vehicle with no compensation for myself.