It is true Saurabh. Actually similar reasons led to the creation of the MAXDB (using some inbuilt technologies mssql). We have some customers using this; mostly smaller customers with less data. Adminstratoion of MAXDB is also not that complex.
If I am not wrong, 70-75% % of customers are on some flavour of Unix OS. We have dedicated OS support guys and if they are not able to resolve the case, partner colleagues (like ones from oracle) are available for further assistance.
Regards,
Hemanth