The number of hosts in your statistics window is completely unimportant. If you'd ignore it, you'd sleep better.

Especially if you are a simple client (not an Ultrapeer), the number of hosts just reflects the number of ultrapeer-pingreplies you receive (aka the number of ultrapeers you know).

If each Ultrapeer has 60 shielded nodes and each shielded nodes had 3 ultrapeer-connections that would make 200 known ultrapeers 4000 hosts. How do you like that?