Only once have I ever regretted letting one get 
away. I know exactly why I did so, but that doesn't 
make it any easier. I'm also fairly sure the person 
who won the cel at least lurks on this forum, so 
I'm not going to say what it was because I do not 
want to spoil their enjoyment in their cel.

But in all other cases, one of two things have 
happened: either the person who did win the cel 
ended up offering it for sale/offers, and I was 
able to obtain it that way; or another, usually 
better, cel from the same sequence turned up, 
almost always at a better price.

Patience really does pay off.