I think the interest is so small, because there are not many alternatives. Of course I understand their business model. We must all make money. But I think with real alternative for open source databases also increases the interest. It should PostgreSQL and MySQL lead. Even if these users are not prepared to spend much money, this is certainly a business model can be found.
This will certainly times larger projects realized so far on the borders of "MS-SQL Express" and "Oracle Express" will fail.
PostgreSQL provider is rather a waste product of the Oracle provider.
Sorry for my english. ;)