A number of the large ad networks I work with requested Google Analytics data for review when going through my application.
If you ever want to sell your site, having a decade of Google Analytics is valuable.
Yes, you could use a different analytics software or logs for the above. However, since Google Analytics is the standard, it's familiar, trustworthy, and performs equally across all sites. For example, Google Analytics shows I have about 1,000,000 page views a day. I have Apache blocking at least 30 user agents from common types of bots and scripts. Even so, my database logs show about 10,000,000 page views a day getting through to my site. That's a pretty large difference in reporting. This is why if someone is buying or analyzing a site, they want to compare the same source, such as Google Analytics, across all properties they're considering.
If you ever want to sell your site, having a decade of Google Analytics is valuable.
Yes, you could use a different analytics software or logs for the above. However, since Google Analytics is the standard, it's familiar, trustworthy, and performs equally across all sites. For example, Google Analytics shows I have about 1,000,000 page views a day. I have Apache blocking at least 30 user agents from common types of bots and scripts. Even so, my database logs show about 10,000,000 page views a day getting through to my site. That's a pretty large difference in reporting. This is why if someone is buying or analyzing a site, they want to compare the same source, such as Google Analytics, across all properties they're considering.