Your keyword selection should depend on the conversion probability related to the keyword combined with the search volume. You dont want to put too much SEO effort on a keyword with very little search volume however as you mentioned correctly, Google's keyword tool info is not always accurate.

Low volume search terms might be very valuable for some industries as even one sale resulting from those keywords can mean a lot of revenue for the client.

lol , that's always fun , all the best..

Barry had an interesting post on this topic basically stating that paid ads do influence organic ranks .Link

(http://www.seroundtable.com/google-organic-paid-study-14942.html)

When you are on this website, one of the links clicks to http://www.monsterbacklinks.com/ where you have this company advertising 1200 backlinks for $157. This is definitely stuff i would stay miles away from. (I can see Rand shaking his head in disappointment at this company and getting really really mad :):)

Here is the simple answer. Why would you want to put your site or your client's site in jeopardy by engaging this company for link building. If you do get penalized , it will take a lot of hard work and effort to get your rankings back. The bottomline is "nothing comes easy". Top rankings for competitive keywords require a lot of hard work and effort for long lasting results.