Hi Steve
I’m afraid this is too much of a good opportunity to punt our retention for me to let it go. The whale that you are speaking about has been playing for the past 21 months, not 9. Both this whale and your more recent one that joined 6 months ago have been in the casino today.
The stats at WagerShare make is very easy to track the play of your whales. Simply click on the ‘all purchasing accounts’ figure in your online stats to be taken to information about your players. There you can find information about when they first played, last played, how much they’ve deposited, how much revenue they’ve generated, the games they are playing and much more.
Sorry to butt in on the thread but I couldn’t let you go selling our retention short. 
Give me a shout if you need anything.
Cheers
Tim