I must say that in my case PRO helps a great deal, but that's maybe because I am after rarer files. Like getting 4 results all with 1 host with PRO and zero with BASIC (exept off course for the junk results and viruses) which by the way also popup using PRO

If you only search for popular stuff then there is probably not a great need for it. Using Limewire is also an art of using the right searchphrases. As time goes by you will figure out how to search