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.
Not sure I would ever recommend testing domain names on NetSol's WHOIS server though.