I never break into anything if I have nothing to add. But one reason I don't bother is the 10-min monologues discussing every detail of such matters, when it would be easier -- not to mention briefer -- for the QSO to go like this: "Hey, I did some mods to my ABC transmitter to improve XYZ. Anyone want to hear about that?" <Silence means, no, not really> But a taker: "Sure, I do. Can you briefly tell me what you did and why you did it? Make this a break-in QSO so I can ask questions." "Okay, I changed R46 to 47K, R103 to 75K, C15 to .1 uF and C29 to .22 uF." "Great, what did that do -- briefly?" "You're hearing the result; the audio is crisper, rolls off below 300 Hz and above 3000 Hz and sounds nicer to me when I listen to it." "Cool!" Did you experience any downsides to this?" "Nope, it's been working fine for two weeks now and everyone seems to like it." "Great, thanks for letting me know." That whole QSO could take place in 60 seconds and wouldn't bore any listeners to death. This is more like actual conversation, like you'd have in person or on the telephone. I don't know why being on the radio should make it different.