Hi I am interesting in buying ads on sites directly. So I communicate directly with webmasters and agree all details. Is it reasonable to ask temporary access to Google Analitics in this case. I mean - you somebody will ask you about it, will you give an access? If no, how you will prove your stats? Thanks in advance.
I wouldn't give out that type of account information, no. There are other tools that allow you to see a site's traffic breakdown without needing a webmaster's GA account, such as Alexa.
We have seen cases where you can add the publisher to add your Google Analytics account on the site temporarily. This is done when buying domains or sites with traffic etc.
You can use quantcast.com to see traffic stats, demographics, geographic, business, and lifestyle for a site you are interested in buying advertising on.
I would not give it out to someone. There are many services that can provide the information that you need. Some of the suggestions above will help you get the best information which will help you choose the sites that are the best ones to buy ads on.
This explains how to grant View-Only access to someone. You control the reports they can see and can remove their access when you are done. You don't have to give them access to your personal Google account. http://support.google.com/googleanalytics/bin/answer.py?hl=en&answer=55501
In some cases i may give advertiser with the limited access to my GA account. But we must be aware in this cases, sometimes competitors may try to know our website. even we have some alternatives where we can use them to prove the statistics of our website. alternatives like: sitemeter, Comm100 visitor monitor (most powerful feature in Comm100 Live Chat software).
Personally, I would not give away this kind of valuable information to advertisers. It's always nice to hold a few cards close to your chest whenever you're doing business. Honesty is important, but you don't want to be too transparent with your site's performance. All information has a price! Limited access to GA is a good alternative. You can also pluck out a few key numbers from your reports, which is usually what advertisers are looking for anyway.
A screenshot for anyone interested in proof of your websites performance should be sufficient. If you are putting together a pdf or something for advertisers to view before buying advertising from you, then I wouldn't put this information in there as it would be more difficult to update. I would simply let them know that you can verify traffic numbers upon request.
Thanks to everybody. Brief summary: it is not usual for most of you to provide advertisers with limited access to your GA stats. Strange but true.