Fundamentally, file system clusters are a very difficult business to get into and make enough money to justify being in that business. On a low end there's open source stuff that kind of sort of works. Selling consulting on a top of it is at best a ramen-profitable business. No one is buying a Ceph-consulting for a million dollars if they run a business that needs that size of storage -- the data is too valuable to do a semi-custom solution and be a test case for Ceph, Gluster, etc.

On the top end there are EMCs of the world with $350K/node pricing + yearly 10% support contract. Finally, there's a "rewrite the app" alternative ( call it 1 year, million $ price tag to move to object store ) that a customer company is always considering.

So the sweet spot is enterprise solution with a license cost of about $12k-$24k per year per node which has EMC/Isilon/NetApp-like functionality that unbundles software from hardware. The tricky part is that it needs to be a proven solution that works on the comparable EMC/Isilon/NetApp sized deployments. To do that one needs to have a lot of excellent engineers that cost a lot of money, a lot of sales engineers that intrinsically understand the commonality between the customers' requirements and can explain it to those engineers and a lot of very expensive test beds.