but for Mostel, the only 'regret' or 'mistake' is not be able to see it in metal and decide.
Not everyone fits or likes black dial, so if it's the color that intrigued Mostel, he will already jump on it , just like you 
I like the idea of having the Platinum 5970 too, trust me 
When I first turn down the 5970P, it was a big 'internal struggle' too. I have seen the watch itself, not impressed with the dial but still, the myth surround this
platinum 5970 still intrigue me and make it very hard for me to say no. I keep asking should I get this since it is the Platinum piece though I find the dial a bit 'lifeless'.
After a few days of struggling and asking around, I come to my current conclusion. I can live without it and no regret 
I have to be happy with the watch and not the air around the piece which may disappear. The second time I was offered, it was an easy no 
The only difference between my scenarios and Mostel is I get to see the watch in metal. Mostel may actually love the watch when he sees it in metal, it's hard to tell.
So, that's the only regret he will have ....not being able to decide with the watch infront of him.
Cheers,
CL