[hydroid7]

I think it depends on the business you run. To be honest, I would not mind building a billing system if my company grows to an unicorn!

[Rafsark]

How do you know in advance it will grow into a unicorn? I tend to agree with you, but that's a shame to have a team of 30 engineers working only on billing, even if you are a unicorn.. I would prefer to have them working on my product