Hey old buddy, the fact of the matter is Google loves fresh,original content on a consistent basis ! I have written original, fresh content on many of my blogs and boom it gets ranked higher than it was before. The reason is Google looks for material that will help their Users and make it a good experience for them.They crave it so their users get the best possible content and info instead of rehashed material that has been copied over and over by Webmasters. Blogs that are ranked high in SE without any original content and are stagnant can sometimes get put in low rankings. The reason being because of other sites taking over the high rankings with their newer and more up to date material. Its all about the end user !!
Plus, you can go to the top Internet Forums like Warrior Forum and the highest earning Internet marketers there have a Mantra : Content is King.
There is a reason why this is there Mantra.......... You Post new useful, fresh and original articles on a regular basis and users and visitors will keep coming back in the droves. Pretty simple actually.
The way it works is after each Post you ping to get the google spiders to come out and index your site and Post. The more you do it the more times the spiders come out and crawl it. And after time you build up authority and work your way up the Search Engines and get more Organic traffic coming to your Site. And if you continue with good, fresh material (and some SEO work) you will develop this Organic traffic into long time visitors who become customers and referrals.
I have data that 100% supports this.
It is in no way a myth.
But I have to admit much like you I have done fine with some of my blogs which rank good and have visitors becoming customers for years and years with limited content and updating; the content mostly coming from borrowed material at Ezine Articles. Go figure
But lets agree to partially disagree