It's interesting he said that...
He's an STH that, while shouldering the risk of the TPA with TN, has no problem selling you games to you at cost. Seems like exactly the type of deal that the STH who are not renewing are complaining about. Perhaps it's mutually beneficial for both of you, then it's good.
However, I feel as though you've essentially become a share partner of his with less power than an actual share partner. Sure, there's no term commitment and you might get to cherry pick games, but it's unlikely you'll get all the games you want, you might even end up getting the games you didn't want as an actual STH or share partner. You can maybe counteract this by having the luxury of being able to cherry pick games from multiple sources (kijiji, etc.). However, that may require just as much effort and networking as selling games you desired less as an STH or share partner.
Your net gain/loss seems negligible.
Having said that, it does fall in line with one of my beliefs, which is to feel like you remain a "buyer". It does allow for more of a "positive" feeling around things.
In the end, it's really all as 6 of one and 1/2 a dozen of the other.
Go with what makes you most comfortable.
Yes, quality over quantity.