Friends hi-fi system not very good, what do you do or say?

A good friend of mine knew I was into audio and he asked my about his system.  He was using Bose 301 loudspeakers and I told him he could do better.  Now he loves music as much as I do and he's also a good guitar player.  In his opinion the Bose loudspeakers could rock and he was happy.

I few months later I'm at an estate sale and there's a mint pair of Dynaco A25s for $40.  A few months after that I get good condition Pioneer SX434 for $20.  I give them to my friend.  He loves them, but he still kept the Bose.  He's not an audiophile.  He doesn't have a sweet spot and he doesn't worry about soundstage or imaging.  With his modest system he enjoys listening to music as much as anyone on this forum.

Kinda feels like a forced premise here, and in the subject title you refer to the individual as a "friend" whereas later it appears you’re not really acquainted with him.

Hasn't the OP already pretty much stated that this is another one of his imaginary scenarios that he likes to post, for some reason, in the amps/preamps forum?

Yeah, it's a hypothetical here guys, thought that to be obvious.

Given the money pit that this hobby can quickly become my advice would be not to say anything about the system.  If your friend is happy with its sound that's all that counts. 

I work out every day and eat really healthy and for some reason when I tell my friends that they look fat, ugly and out of shape….and that I can help them, it’s not taken well.  What’s wrong with them?