The problem is that the multi store sites need the staring prestashop site to initialize from. Taking that away leaves them hanging so to say.
One solution is to have the static page as your landing page, where you have links to the different multi store sites, but they all have to point back to the existing prestashop start page to get their initialization. This is a bit confusing to explain in text, so behold my awesome painting skills...
When someone go to YourWebsite.com, they are getting to the static page, when the click on a link the go to YourWebsite.com/SubFolder/A (or B or C). I suggest better naming of course, a suitable name could be "home" or something for the "SubFolder". Anyway, my point here is that the original site must remain to initialize the other sites, and thus must remain within the site. This leaves a problem tho. It is possible for anyone to type in the address to YourWebsite.com/SubFolder and end up on the prestashop starting site. But you can just have a small message saying something like "This is not the page you where looking fore, please visit..." and have links to the real start site and shops.
I hope this clears it for anyone trying to do the same thing.
