Here is how I reason. We had Adsense, Yahoo YPN is in Beta and MSN AdCenter is in Beta in in France and Singapore. Sonn it will be here too. And also we have other smaller players such.
Smart and large publishers would always like to diversify. That's good business.
Therefore let's see these two options.
1. You give part of your site to Adsnese, another part to YPN, and the third part to MSN (not to mention any smaller players.) Thus you want to diversify your revenues which is smart. You do this because the rules are that you cant have the ads of the competitor on the same page.
2. However, imagine if you could give one ad location on a particular page to Adsense and another location on the same page to Yahoo YPN. In the different category page you could give one location to Adsense and second to MSN Adcenter. WOULD THIS BE A SITUATION THAT EVERYONE WOULD BENEFIT?
I believe so.
The second option is more interesting and give peace of action to everyone as markets become more competetive.
Should we all advocate for the possibility of running other contextual ads on the same page?
I would just like to have a fresh view on this topic because the analysis showed that all would benefit from this.