If your search turns up 2 files, each with 10 sources, your search will have the number 20 in the green bar

People share junk. Some do it intentionally. Some do it intentionally (spam). Have you checked these files yourself, or is Limewire simply marking them as junk? You may want to have a look at your junk filter. I have mine set to relaxed, and I just follow the advice in the forums to avoid spam/viruses.

How to filter porn & spam
Fake files showing up in search results
How to find music

Limewire Pro allows you to connect to 5 ultrapeers, whereas Basic only allows 3 ultrapeers. This can indeed give you better search results, however, if no one is sharing the files you desire, you won't see them in your searches!

Your one-time payment of $18.88 USD allows you access to support and updates for six months, after which time your software will still work! You just won't have support/updates available.

Good Luck

P.S. You won't find everything that you want with Limewire. Nor will you find everything you want with any other program. Sometimes I use other programs, but Limewire's my favorite