Actually i was think that.... have their any good value??? if i add robots.txt file on wp sites or maybe any others. I have see many sites whose dont even have robot.txt file in any of my websites but they are good on SERPs and better be a indexed as well. one of the RoboGen Product value is $24.95 for a single-license. but have anyone provide free robots.txt ???
What are you wanting to do with your robots.txt file? Its only useful if you want to block certain spiders from accessing certain files or folders on your site. There are plenty of free services to do it for you (search google) and you can validate it from inside your google sitemaps account.