direct marketing success rate

[Shweta Gupta]

hi there as I go along the steps direct mailing seems like aiming at a black cat in the dark. For all of you who try direct marketing through yellow letters/postcards what's the success rate? how $$ amount on average do you spend in acquiring lists & mailing ?

On a separate note has anyone tried tax defaulters data too?

Thanks for your response.

Shweta