Rooney and his co-authors found that special events, including fun runs, generated an average of $3.20 per $1 dollar spent organizing them. Telephone solicitations, by contrast, raised almost $12 per $1 spent, the study found, while capital campaigns raised $20 for every $1 spent. - http://www.usatoday.com/story/money/business/2013/04/08/in-long-run-do-charity-races-pay-off/2064757/