$4 isn't exactly going to breathe bank though, I really couldn't care less if a team set is $2 or $4.
I remember back in the mid-90s the card shops used to screw us to the tune of 50 cents for a common ... a whole Dynamic team set (including subsets) could set you back $10 or more ... huge money for me as a youngster!
As for the 2007 Johns gems, I got one for $20 ... I thought one got lost in the post, but it actually got sent to an old address. So anyway, i ordered another one before i realised what had happened. Then Johns retired, and by the time I got the first one back to sell on eBay they were all going for between 60-100 bucks, made a nice big profit on that one!