There are license restrictions on giving your customers access to your QV server (though the Extranet server might be an option, with limited features, e.g. number of documents).
From my understanding, it would be good to get in touch with a Qlik sales rep. Your business model seems like a candidate for an OEM licensed server.
edit: You may also look into QS / SenseCloud.
I also would suggest looking at QlikSense. It is a product designed for today's internet age and may well give a more cost effective solution to your needs than QlikView, depending on the details of your needs. You could also host it in the cloud, AWS is one option, then you won't need to worry about buying a box, internet pipe, aircon etc......
Do contact Qlik Sales - they wish to sell and you are looking at buying, so you should have synergy there.