Originally Posted by 1800HART
But - would that mean you are not familiar how good "multi-Datafeedr-sites" are on single shared servers?
The thing is, there's no easy way to estimate what you need until you need it. It's based on so many things (that I mentioned in my previous post) and I'm unfamiliar with any calculator where you could punch in the variables and see what resources are required.
Shared servers can be hit or miss. Sometimes the server you're own is great and always up. Sometimes there's a user on the server that always overloads the server. Sometimes hosts don't oversell the server too much... other times they do.
My experience with shared hosts, VPS and dedicated servers is that I eventually always out grow them. Usually this is because of traffic to my site. So I consider it a good problem. Because the more traffic, the more revenue I have. The more revenue I have the more I can spend on servers to keep the sites up more often.
But honestly I can't really answer your core question. It's a really difficult question that depends on so many unknowns.