I would be amazed if anything more than a small minority of CCR holders have got the card via Tier Point Runs. Its such a lot of travel for such a minor benefit. My office has 6 or so CCR holders, certainly none of us got them for anything other than regular travel.
I'm likely to travel a lot less to Asia in my next membership year, so will probably fall below 5000 TPs. My "magic" number is 3500, which I'm sure I will be at through natural travel. I reckon I'd need to be stuck at TP 4800 or so before seeing any need to do a TP to get to 5000.