Define "using" a domain name. I have a couple of domain names where my primary reason for holding them is for email addresses, or an inside joke with friends.
Admittedly, no-one is clamoring for these domain names, let alone offering me $7500 for them for their business, but just because you can't see the use doesn't mean that they're not being used.
Yes, domain name squatters suck, but they're making money, so they'll keep doing it, and there's no way to fairly stop them that doesn't take away my right to hold stupid domain names.