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You can go higher by using AdWords.
That just goes to show that it's all about the money, and stockbrokers are now turning the algorithm dials and pushing the ranking buttons at the Plex. Sergey and Larry are being retrained as ad reps, GoogleGuy will soon be replaced by WallStreetGuy, and Eric Schmidt is overseeing the changes from his new office on the grassy knoll.
This is the new physics of SEO and this is the answer to all the confusion and gnashing of teeth we see on webmasterworld when it comes to Google SEO.
Nobody is mocking you - just having fun with the OP.
<<<<<Since sept 2004 I have been vanishing every 6 weeks or so, and now more often than that. Is that why Google is doing it?. Advertising with adwords is sooo expensive now and I can't afford it all the time--I'm just a small business. They never tell me why, they always respond the same way. Are they doing it so that we will advertise with them?. But the other high ranking sites of my type never vanish. Why me? >>>>>
I noticed the same thing on one of my sites pre Florida. The site was #1 for a very competative porn star name for a number of years. About 6 months before Florida - the site was doing the same dissapearing act as you mention. Since Florida it has never reappeared in the serps.
What does it mean? My theory is that certain tokens get put through the filter and some don't. When your site dissapears and reappears - the plex is testing adding your token to the barrel. My guess is that next update your site will be at #356 and all sites that link to you will be way ahead of you and you won't be listed for your company name.
<<<<<Are they doing it so that we will advertise with them?>>>>>
(Foil hat firmly in place.)
Google Penalizes for being #1! Yes, it's true! Once you are in the #1 Position google WILL NOT let you get any higher, but WILL allow you fall - often drastically!
This happens time and time again on this forum. Just because this is your experience does not mean this is how Google really works.
Stick to the facts and we'll all be better off.