How to display hidden prospects

UPDATE - after further use I can confirm that hidden results do in fact make a come back if the source visits the tracked web site again. Is this really the intended behaviour?

My difficulty is that I have a customer portal on the company web site, so a great number of visitors are existing clients. If the hide function removed these results, and they remained removed, I can effectively and over a period of time weed out these existing clients and of course I would be left with real and potential prospects. As it currently stands I can’t really see the wood for the trees.

This isn’t a deal breaker for me, indeed I wasn’t even aware of the prospects function when I chose this CRM solution, but, it would be nice if the hide function worked as I have described above. It would make, what seems so far into my trial, a good solution even better.