You can have as many sites as you would like

You may wish to consider the use of sudomains to allow the main domain to be your ptich site while the support.yourdomainname might be a better way to keep the two seperate than having a combines swiss army knife website

Read more ...

Because it goes to the core of the arrangement, the belief that each will support the other over the next x years.


This is more reassuring to clients than a buy it and now you drive it approach. There is so much more to  maintaining a sites relevance to its audience