the reasons why our artists are that stingy for most they came from at best average background,so when they get some money they want to make up for their years of struggle, some also are stingy because they consider that they have the "biggest spiritual burden of the group" so its normal that they have to keep it for themselves,also because of competition,for example they'd tour or record an album and earn good money by selling songs to customers but leader will keep it and buy a house or a car because he has to either keep up pace with the rival or try to "reduce the gap" like they consider it
another reason is that for them when musicians get money, they start partying and come late at concerts or rehearsals or miss out so it disorganizes the group