Now the accusation is that Network Solutions are spying on the users of its whois service, by recording the searches and then reserving the domain. This doesn't bankrupt them because they can drop the domain before the five-day grace period ends.
This has the result that for those five days, the customer can only buy the domain from Network Solutions, other domain name companies are locked out.
I should probably move away from them, anyway. GoDaddy, which manages many of my domains, is much cheaper; it's got a pretty crappy-looking website and cheap-sounding name, but it works.