is it good idea to block bots from website through robots.txt

Question

Hello,

Here is the copy of my robots.txt content

Sitemap: http://www.go4film.com/sitemap.xml

User-agent: ia_archiver
Disallow: /

User-agent: robtexbot
Disallow: /

User-agent: Googlebot
Allow: /

Here I only allow googlebot.And block Alexa and everything

So could someone please tell me if I block search engines like yahoo,ask,bing and archive like alexa from my website what I did in my robots then whether it affects my visitor count or ranking in Alexa or indexing in yahoo,bing.

Answer 1

I think to ban yadex.ru now It started make half traffic of my picture site ;)