demo with virtuemart not visible?

why virtuemart demo its not installed with the quickstart package ?

What do you mean by VirtueMart demo ? In quickstart package you get products/categories which you can see in demo.gavick.com so what data is missing ?

i installed quickstart for joomla 3.0 and there was no virtuemart component ...

then i tried joomla 2.5 quickstart and works ... looke like there is no virtuemart for 3.0

Yes, there is no VirtueMart version for J!3.0 so this is why you can't find it in our quickstart package.