This multimethod study examines selected characteristics and the motivational dynamics of remunerated blood plasma donation by U . S . university students . Ten percent of students surveyed reported selling plasma . In comparison to nondonors and nonremunerated student Red Cross donors , paid student plasma donors tended to be predominantly male and from higher income families and to have higher rates of employment while in school . They also exhibited greater rates of alcohol consumption and cigarette smoking . Drawing on focus - group and individual interviews , the authors describe the student plasma donation experience , with particular emphasis on motivational dynamics . Unlike nonremunerated Red Cross donors , plasma donors do not feel a strong identification with the altruistic aspects of the blood donor role . Rather , they are motivated to continue donating in order to secure an easy source of pocket money , which they tend to spend freely , especially on social drinking in student bars . Among students willing to sell plasma more than a few times , self - deferral from long - term donation tended to result from growing concerns about the physical effects of continuing donation , increases in disposable income from other sources , or both . The article concludes with a discussion of the implications of the findings for social policy and for future research .