If you go over and above the call of duty and the customer buys the bow.......You've spent "X" amount of $$ on labor for that period of time.
If you don't go over and above the call of duty and the customer doesn't buy the bow......You've spent "X" amount of $$ on labor for that period of time.
The "X" doesn't change in either scenario. Your bottom line does in scenario number 1

.
I, admittedly, don't know your business, though. Granted.....if you're so busy you don't HAVE time to do this for your customers.....then it's a moot point. If it's a matter of choice, though.......thats entirely different. I wouldn't fault (and don't) you for either.....not in the least.
Good to have a real shop owner in this discussion, too.