Are Probate Notices in the Paper Good for Wholesaling?

[Jeff G.]

So, I'm considering mailing some probate leads. I'm trying to understand a few things about the notices that get posted in the paper along with a few other things.

Do yellow letters still convert well when mailed to the property/decedent's fiduciary? 

Do the different notice types "Notice to the creditors of..." and "Insolvent estate...." notices inform as to the usefulness of the lead?

Because these properties are tied up in probate is there a long delay between presentation of offer and getting the contract signed?

What happens if the deal falls through, by which I mean you can't find an end-buyer for some reason?

Is there anything else I should know before adding this lead type to my pipeline?

Thanks!