I remember thinking back when I worked for a web design company on a contractor basis, must have been about two years ago at this stage I reckon, but anyhow if one of their clients was not happy with the results coming in from organic
SEO then would use some of the per month maintence fee towards buying visitrs on the
PPC side of things.
I wonder is (was) this perhaps a little short sighted in the sense that there was less money to committ to organic
SEO in terms of man hours for tweaks, directory submissions, new content etc. So although visitors where coming in from
PPC, the goal of organic
SEO would have likely taken longer now overall.
In the general sense I suppose if a ecommerce site is new and has no traffic at all and there is a budget for it, it is prob a good idea to use
PPC for the first 8,9,10 months or whatever before any natural rankings come through, rather than simply waiting for the sandbox to lift.