I was also thinking this, but I think shaming people for spending money the way they want is counterproductive. Same as with veganism, claiming the moral high ground (even implicitly) can be very galling, even to people who would otherwise agree. I think it's cool if people want to spend their money to help others. If they want to spend it on a nice suit instead, it's not my cup of tea but there are much more harmful ways to spend it.