>> @koan: Funny how desktop traffic is now premium traffic.
Because mobile is ridden with clickfraud botnets that you can't easily identify (nor Google wants you to).
And that can't be blocked by IP as mobile IPs are dynamic from pools. Because you can't tell whether it was legit user or some rogue app launching the browser from a mobile device. The non-zombie, non-fraudulent, converting traffic naturally becomes "premium".
On my ecommerce, my mobile user conversion is below 5%. I could do 95 other site improvements to improve life for desktop customers before even touching "mobile".
>> @NickMNS: First making a site responsive should not be any more difficult or costly than simply updating your site
I have two large sites that were build before 2005 , so hence with tech of early 2000th in mind - no divs, tables , barely any css. I already spent a year on one site in a redesign and still am not finished.
Second site I am not redoing - and this was Adsense largest earner - since it is only making 1/10 in Adsense revenue from 3 years ago, on maybe 60% of traffic. And its my lunch money now, it costs more to host it now (dedicated server, DB etc) than it earns in Adsese. Who will pay me for a responsive design, Google, who took content, images and made out ok on it? Where's my ROI.
[edited by: smilie at 1:28 pm (utc) on May 13, 2016]