I'm extremely responsible, and go through 2 pairs a year... On average.
I'm comforted by every SJ & sound engineer I know making my track record look like the holy grail.
If he actually USES them... Takes them everywhere... Loves them: Expect at LEAST 1 new pair each year. These are the responsible kids that love music... So they use their equipment. A lot.
Which doesn't mean buy cheap.
It means either
- Buy where there are great warranties
- Expect him to buy replacements
BestBuy is where most sound engineers & photographers buy their "walking around" gear. Because of the FABULOUS warranty program. Yeah... I took the camera into a foam party. And? Ah. Thankyou. (These are also the people who keep the "refurb" supply running strong.).