Yep - this applies to many desirable cars. If you're a serious buyer with the right budget then daily AT/PH/forum searches are a must - even twice daily and then be prepared to travel, quickly.
I bought a 330d touring a few years ago that was truly fantastic, but it got listed on PH at 4pm on a tuesday, I drove 150 miles each way that evening to view and put a deposit down as the chap had already had two "I'll come at the weekend" phone calls by the time i rang at 5pm.
Likewise, when I sold my wife's Suzuki EN125 motorbike my phone just didn't stop ringing. I put a realistic price on it as I didn't want it hanging around and it sold within 50 mins for the asking price.
Price price, right buyer, decent advert and quality product and things sell quickly.