This is strictly a guess as to why. But most of any brand of compact cost a little more. Take a look at the production 1911's also. It may be the bull barrel in the 1911 version which equates to the number of barrels made.
I do know this the full size outsells the compact about 3 to 1 for me.
I just added to Terry's statistics by taking delivery of a full size CQB. As advertised, Terry was a pleasure to deal with. Very helpful and that was months before I decided to buy a pistol from him. He met and exceeded all expectations. Would I buy another gun from him? Hell yeah!
I just acquired a CQB Compact from Allen Yoast and think I'm going to like it as well as my fullsize Tactical. Hope to get out and shoot them both this weekend. Allen is as good as Terry Peters to deal w/ as well. I wouldn't hesitate to do business w/ either.