Stopping Google Bot: Good Idea

I saw this tread on another forum, but not one answered they guy. Thought I'd asked the question here:

I'm thinking of using this as my robots.txt:

User-agent: Googlebot
Disallow: /

User-agent: Googlebot-Image
Disallow: /

User-agent: msnbot
Disallow: /

User-agent: Slurp
Disallow: /

User-agent: yahoo-mmcrawler
Disallow: /

User-agent: yahoo-blogs/v3.9
Disallow: /

The reason is in order Google, Yahoo, and MSN bot cannot index my page, but the adwords bot (AdsBot-Google) and other PPC bot can. This is for A/B testing, also with SPPC we get tons of different LP version if you make the LP dynamic. I'm thinking if my content get indexed it may lower my QS. Is this the right move?


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Also, what about stopping the AdsBot-Google (adwords bot) when putting up a campaign...would this lower your QS?

sounds like a good idea. try it on a site you don't care about 1st!!!

Here some more infos about bot

-http://w*w.g*ogle.com/support/webmasters/bin/answer.py?hl=en&answer=40364

Tell me if it works please

Thanks

Yeah,

I understand how to stop the bot. Just wondering if anyone else has and did they see a drop in their quality scoring. I'm about to put up a campaign and I'm curious to if I should even try to go this route.

Can someone explain why stopping a bot would be a good idea?