The
AffStat 2007 Report by Shawn Collins reports the following numbers, which include incentives and bonuses (The AffStat 2007 report is based on the answers of almost 200 in-house affiliate managers and OPMs who voluntarily filled out a questionnaire with a long list of questions about their affiliate program. The full report is only $130 BTW and interesting reading material if you are managing an affiliate program)
Figures are annual income and are only for In-House affiliate managers.
24% < $40K
24% $40-$50K
26% $50-$80K
26% $80-$120K and more
The AffStat report breaks the numbers down a bit more. Also interesting; almost 60% of the managers state that their income includes incentives and bonuses. Salaries vary of course per region, but you get the general idea.