Link wheels are complete and utter crap. And no, I have absolutely no compunction in saying that whatsoever. They fail to address anything important, or, for the sake of this discussion, relevant to the task at hand.
I am in a perpetual state of utter amazement that folks actually fall for this sort of thing in the services section. This is on par with "we submit your site to 5000 pr 5 directories" While accurate the home page of some unattended directory might be ok, the page with which your link is actually on is not indexed and will stay that way forever. This is because the site offers absolutely nothing to anyone. When is the last time you perused a directory to find something?
I could frankly go on about this for a week.
Don't believe the hype people. I do get a kick out of staring at some of nifty charts these nitwits come up with though.
Dreadfully long story short, don't waste money on fad related nonsense. Track down someone who actually understands the value of merit based, relevant and useful links. Its not rocket science, it just requires actual work.