Is there really a market for these kinds of relational tables?

I created a system to support my custom object store where the metadata tags are stored within key-value stores. I can use them to create relational tables and query them just like conventional row stores used by many popular database engines.

My 'columnar store database' can handle many thousands of columns within a single table. So far, I have only tested it out to 10,000 columns, but it should handle many more.

I can get sub-second query times against it running on a single desktop. I haven't promoted this feature since everyone I have talked to about it, never had a compelling use for it.