In episode 170 of Semantic Mastery's weekly Hump Day Hangouts, one participant asked how high monthly SEO retainers could go.
The exact question was:
How high can monthly SEO retainers go? I used to think the limit was like 2K a month, but my time in the MM has taught me that my services have the potential to do a lot for a business. Of course this kind of thing varies by industry and business size, but I'm willing to bet that I've been thinking small until recently.