Exp with Acxiom Lists?

We just purchased some Acxiom Lists from TRG and are planning to mail out to 30,000 new constituents.  We are predicting a 1% return rate from the mailing since we will mail to them 3 times: one brochure and 2 postcards.  Does anyone have any experience doing this type of mailing?  Are we crazy to think we will get a 1% return rate?

Thanks,

Janna Ellis

Yale Rep Theatre