They wanted to know what you use. Maybe they will consider buying a payment processor / shopping cart.
We have used 2checkout for years and they have a running tab on their homepage showing how much dollars have been processed thus far in the year. Over 15 mil in 26 days ... not bad considering they charge 5.5% plus.
Ebay bought Paypal sometime ago. There is definitely room for two major, first tier payment processors.
:)