You can raise funds if your service generates good traction and you manage to get long term subscriptions. Your clients will play a significant role in the funding process by providing their positive feedback and the prospects of the business in long run. You can run a survey asking your customers whether they will stay in long run? If you get a yes from most of them then this will serve your purpose of convincing the investors.

Pricing should be defined by the market forces, the demand and supply will work to get you a optimum price. Try A,B,C price with X,Y,Z demand and plot it in a graph through excel.

I can help you in the entire process.