NO! Please don't pay. The information they offer is not necessarily helpful to you as a buyer. You need to know what homes are for sale. A local real estate agent can share this with you - their access includes REOs (post foreclosures), Short Sales (pre-foreclosures), as well as traditional sales and new builders.
Just because something is on Realty Trac doesn't mean it is actually for sale, nor can they offer the marketing information you'll need to know - what's it like? are their pics available of the inside? how much land? what do they want for it?
Call a REALTOR today.