It sounds like in effect you want to pay a users ISP to zero-rate traffic to your site, similar how to some cell carriers allow you to stream video from certain websites without impacting your allocation. If you are a major company like Google or Netflix then this has a ghost of a chance of being feasible, otherwise most companies will not talk to you -- its not worth their time to implement the necessary infrastructure for such a small user base.

The corporate or school clients (I am thinking such as a hotel) may very well not have the capacity to scale their bandwidth in an economic way either. They may have the equivalent of a T1 (hence the connection metering), and the only way to go above that is to buy another entire T1. You aren't going to want to pay for that. If your service is profitable enough to make those kind of deals anyway then your clients would be able to afford commercial tier ISPs anyway and won't need you to do so.

If you approached someplace that could meaningfully scale their bandwidth, they'd still want you to foot the bill for the whole years worth of extra bandwidth since they likely have a yearly contract. Anything government or education related (state schools) would have its own entire issues with procuring extra capacity at your behest.

So, if you have very very deep pockets and an army of lawyers and marketers then you might make some progress, but the model just does not scale and I can't fathom how it would be profitable.