It also left me wondering just how forgiving the limits are - I had a couple of female passengers who were quite uncomfortable about giving their weight & a chap who didn't know his, so short of installing scales in the club the accuracy of self report W&B info must be subject to scepticism.
Declaring their exact weight might be socially unacceptable for some people, but you can always remind them that they are under no obligation to get into the aircraft at all.
I find a good rule of thumb to be, accept whatever weight the person declares (provided you believe that to be reasonable - ie, a fattyboombah declaring she's 60kg is not reasonable), but
add ten kilograms to their declared weight.
If your totals taking into account this buffer zone go outside, or close to your W&B limits, then get out the scales and insist on actual weights.