I might point out as well that Randy sells every engine he makes, and then some. If you call and order an engine, you might wait a bit, especially after the Nats, etc, when he is inundated with orders. A mass PA advertising campaign isn't needed, and besides, pretty much every one who can *use one* already knows about them.
I think most people who embark on a 60 size ship program already have their powertrain selected, as well as their run philosophy (4-2-4, pipe, etc). The wild cards now have been the score and Strega ARF planes, which has boosted many new faces (or at least a few(!)) into bigger planes. These people like the cheaper alternatives of the K&B, etc. (And the few inverterate tinkerers like Willis).
Personally, I'd probably consider a cheap motor for a big ARF, unless I invested the time to really go through the ARC version and make sure its right. I wouldn't feel good about commiting a $500 powertrain to a model I wasn't really sure about, both in terms of flying qualities and control/structural integrity. Further, I've always felt ARF to be useful in flying in conditions that might be suicidal to one's good plane. The local contest that has 20+ winds on Sunday might not be the best place to risk the plane you intend to fly at the Nats, etc. A Score with the 85 buck Tigre 51 might just fit the bill in those cases.