Trading PostGres for MySql databases

In packages offered ie. Silver there are 2 MySql and 2 Postgres databases included. Is it possible to trade the 2 Postgress for 2 additional MySql databases. In my experience many people use MySql and very few people use Postgress and so this part of the package would seem to be of no value in the offer if that feedback is typical.

regards,
Flash

The packages were carefully designed and trading one resource for other is not a possibility. Having Postgres available for the scalability it can offer is indeed a value add.