I prefer their other method of registering domains that you checked for whether or not they were available. They would then charge a premium to get that domain.
Anyone else remember "Network Solutions Sucks Balls"? (http://networksolutionssucksballs.com ended up being registered by Network Solutions under this method.)
I don't think it happens any more. ICANN added a nonrefundable registration fee and "domain tasting" stopped being such a pervasive problem. This either solved what Net Sol was trying to protect users from, or removed the justification they were using (depending on how cynical you are).
Not sure I would ever recommend testing domain names on NetSol's WHOIS server though.
Sadly, no longer the case.
https://news.ycombinator.com/item?id=96408