I'm confused. Surely the "8 large business customers" would be providing enough revenue to make 50K irrelevant in terms of scaling the business up. If I were

I'm confused. Surely the "8 large business customers" would be providing enough revenue to make 50K irrelevant in terms of scaling the business up. If I were you, I'd be going about it the opposite way: put together a good, detailed business plan, and figure out your most effective growth path. Then, decide how much (if any) outside capital is required to finance that plan. Then, try to find what is the best way to raise the needed cash, and how little equity you'll need to give up in order to get it.