My top three aged sites have 65% BOT traffic.
My mid-aged sites are 35% BOT traffic.
My newest site has 0% BOT traffic.
Are you buying Traffic? Are you monitoring BOT Traffic?
I put a couple of $_SERVER[] commands in my footer. For every hit, I get:
20160126210314, /MJOVideos.php, 66.249.65.41, , ^ Mozilla/5.0 (compatible; Googlebot/2.1; +
Googlebot - Search Console Help) |66.249.65.41,US,United States,CA,California,Mountain View,94043,America/Los_Angeles,37.42,-122.06,807
^^ With a simple piece of data, I can measure up to 65% BOT traffic to my sites, with this simple {HP code:
date("YmdHis").', '. $_SERVER['PHP_SELF'].', '.$_SERVER["REMOTE_ADDR"].', '.$_SERVER['HTTP_REFERER'].', '.$_SERVER['QUERY_STRING'].'^ '.$_SERVER['HTTP_USER_AGENT'] (plus geoip lookup) . PHP_EOL;
And then I Save ('a' append) to a txt file. I change it monthly.