Helping friends and relatives buy an audio system...

This is one thing I have had the good fortune of helping family and friends buy a stereo/music system with very positive results.  I did not have one that went bad or caused concerns.  This went from something as simply as a used KLH compact system for a relative to some relative high end systems with Magnepan, Martin Logan, ARC, Adcom...and more.

As time has passed I am no longer sure this is a very wise thing to do.  I have not done this for some time and am curious to what + or - experiences you have had in helping others with an audio system?   I am sure there are many stories out there.