Assumption of risk might be the greatest unpaid cost your friend might profit by and the cost of a lifetime if it comes due. From a NIOSH report, "The National Traumatic Occupational Fatalities (NTOF) Surveillance System indicates that during the period 1980-89, nearly 6,400 U.S. workers died each year from traumatic injuries suffered in the workplace [NIOSH 1993a]. Over this 10-year period, an estimated 1,492 of these deaths occurred in the logging industry, where the average annual fatality rate is more than 23 times that for all U.S. workers (164 deaths per 100,000 workers compared with 7 per 100,000). Most of these logging deaths occurred in four occupational groups: logging occupations (for example, fellers, limbers, buckers, and choker setters), truck drivers, general laborers, and material machine operators. The actual number of loggers who died is higher than reported by NTOF because methods for collecting and reporting data tend to underestimate the total number of deaths [NIOSH 1993b]"
http://www.cdc.gov/niosh/logging.html
