One of the things told by Oracle rep about their annual support fees
was that Oracle never charges again for a newer version. As long as
the annual support fee is paid on time and not broken, a customer gets
automatic upgrades to newer Oracle versions. Apparently that was the
reason why their annual support fees, expressed as a % of license fee
paid the first time, was more than double of what was quoted by DB2 for
the same hardware.
We were also told by Oracle rep that this is not true in case of DB2/MSSQL
where free upgrades ...