One of my big earner sites is a very small site. The entirety of its traffic is from buyers keywords. So, I assume that all of my sales are from desktop pc's simply because of that -- though I do not use G analytics so I cannot tell. Anyway site is ranking #1 which means I haven't touched it in ages because I never like messing with a #1 ranking. So I am wondering if updating my free wordpress.org theme to the pro version (mobile friendly) is worth it? While I don't think a theme update would tank the rankings; you never know, it may cause some fluctuations. And of course the difference between #1 and #2 is a lot of money.