Think about a company like Comcast -- millions of customers, thousands of phone agents, thousands of contractors in Comcast vans hooking up home service, multip

Think about a company like Comcast -- millions of customers, thousands of phone agents, thousands of contractors in Comcast vans hooking up home service, multiple regional websites, legacy customers from previous product iterations and acquired local cable companies. Add on to that multiple public and private billing plans, service credits, local deals/specials, grandfathered customers on old plans, a combination of fixed and usage-based billing, optional add-ons, and parent/children accounts for business and landlords. Imagine just how complex that "rules engine" has to be to get billing right. The company that can manage that for Comcast is going to be delivering hundreds of thousands to millions of dollars in value. If they didn't pay someone for it, they'd have to employ and manage a large development team just to do billing. Lots of salaries. That's what justifies the price. If you're a startup with 3 payment plans and sometimes you have to give someone a credit because you had some downtime, your situation isn't even 1% as complex, and you can get by with a $50/month service or a couple hundred lines of your own code.