Yahoo vs MSN vs Google

I have noticed a surprising difference in the quality of the organic search engines traffic for one of my sites - while the MSN traffic is the largest in volume it's tottally inferior to the Yahoo traffic in matters of bounce rate and average time in site. The G traffic, the paid G traffic and the Live are even poorer, in this order (for example I have 65% Bounce rate in Yahoo and over 90% in G).
The keywords are not the same but I didn't notice any interesting difference in this part. The niche is health. The site looks Ok and has several internal pages.
If this means that Yahoo people are good customers ( and this might mean something else) I wonder how can I make Yahoo SEO.

Google is the fastest and gets the best results in my opinion.. right now one of my sits is getting 25/avg visits a day by Google and only 5 by yahoo and everything else so im liking Google.

I could like google too if they would send 2K people a day.
In my situation I prefer to like yahoo.
Could anyone help me to like yahoo more ( by making them like me)?

I always feel Google is better for traffic and traffic is more targeted. Yahoo never works for me, no need to talk about MSN.