That is how they can do it 3x cheaper. When you do not spend your time dealing with the business, marketing, etc. that frees up a lot of time and thus cost.
If one was looking to open it up to a wider audience, it would see their costs rise 3x too, but if one is only looking to use something for internal use there isn't much need to incur any of those additional costs.
There is always someone that think they can do it faster and better but happens to never do anything that anybody buys.