10 a game seems like a fair enough average if you are just getting into TC collecting and want to go for a complete collection.
What you save in terms of time, hassle and individual shipping makes it more than worth it.
I happened upon a mini version of this with a local collector ridding himself of all his SNES games just as I was starting to get interested in older titles. To this day I kick myself daily for not buying every single game he was selling. I was too green to realize what I was passing on at the time.
I got most of them though, at an aberage of 40, and they were all stuff I would have paid much meatier premiums for on eBay. Glad I found that guy.