My website is approx 10 months old. Same old story - I am doing great in Yahoo and MSN but having difficulty with Google.
Make sure you count the age of your site - not from when it went live, but from when you began obtaining backlinks that Google recognized. And keep in mind that many many people report decent Google rankings taking even as long as a year these days - add that to the fact that Google is still rolling out "Big Daddy" which has been sort of a mess - so it's difficult to monitor your site with them right now anyway.
One of the first things I did was to purchase 1 way links through a service [removed]. Since then, I have learned they are low quality and probably do not benefit me much. I also have noticed those links disappear on MSN in the last month.
My question is: will I endanger my success on yahoo and msn (and future success on google if a large quantity of low quality links suddenly is discontinued?
Are these the only links pointing to your site? If so, you should work at obtaining some real quality links (which you may already have) before dropping those. You might could drop a few at a time and then monitor the effects.
I don't know what kind of links you purchased, but from what I can tell, Yahoo has no problem with site wide links while Google, on the other hand, doesn't appreciate site wides at all. You fair better with Google to have a small number of links from multiple sites than to have a ton of links from one site.
More than you asked, I know - sorry, but I hope it helps.