stuff
I think there's two important points to make here.
1) Any industry that trys legal action against it's own customers is going to be in serious trouble. The National press would pick up on it and there'd be a public backlash (they'd think they were getting conned somehow). No-one likes a bully industry.
2) Many people (including myself sometimes) hear a component in a system that is not suited i.e. system matching. We all know what a mess you can get in with badly matched systems. If you take your opinion from one listen on one system you may get an inaccurate view of that product. From that point you slag it off until the day you hear it set up properly.
Cheers, Tim