What is the most frequently requested services from SEO companies?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

• 
  Daniel Lloyd Barrett:  ;
  Hello Everyone,
  
  I purchased a domain quite some time ago related to Seo Price Comparisons and now I'm ready to make use of it.
  
  I'm looking for ideas to categorise the SEO services on offer
  
  They way it will work is I create a service to compare. For example "Submit to 50 business directories" then SEO companies will submit their offerings with a price for the said service.
  
  What I'm looking for is the most frequently requested services from SEO companies. This is to help me create the categories for the services to compare.
  
  So what services are SEO Gurus asked for most?
  
  link building?
  Article Submissions?
  Social media?
  Pres Releases?
  Directory submissions?
  Search Engine Submissions?
  On Page SEO?
  Off Page SEO?
  Content Generation?
  Infographics?
  Rank Checking?
  Backlink Cleanup?
  Google Penalty Removal?
  
  Or anything else, any feedback will be greatly apreciated, good or bad. :) Thanks.
  
  
  #seomarketing #linkbuilding #seoservices #seocompany  ;
• 
  Edwin Jonk: Do you also do a form of quality control? Or anything else besides price comparison?
• 
  Jim Munro: I am sorry to rain on your parade, Daniel, but I don't think it will work. Then again, the list of things I've been wrong about would fill an encyclopedia.
  
  The only thing I can say I was right about was Google but it seems likely that it's going to eventually turn out that I was wrong about them too. :)
• 
  Daniel Lloyd Barrett: Thanks +Jim Munro for your comments but why don't you think it will work?
• 
  Tony McCreath: I'd be skeptical. Would reputable companies want to be on such a list. Be very careful what services are compared.
• 
  Jim Munro: I'm sure you know already that SEO is shifting sands, Daniel. :)
  
  What might be kosher today might be poison tomorrow. For that reason it would be difficult to maintain a register but my main thought is that people would not participate. They might not want their brand alongside other brands.