Well mr 500. Plenty of companies DID choose to grow into paying for MySQL support INSTEAD of paying for expensive Oracle servers. Then Oracle bought MySql.
Personally, I think that the creator/owner of MySQL did right by selling to somebody that had the ability to actually FURTHER the product. And provide support to paying customers. Nobody else could afford to buy the size of company that MySQL had become... But at the same time it was still a "toy" database company. ID point out that Oracle was gradually cutting off MySql air supply. They were buying up other opensource projects.. Like Sleepy Cat that created SQLite and other pieces MySql needed. So Ellison was actively trying to corner the DB market on Linux.
The problem is that company was ORACLE. And many people stayed on puny MySQL EXPRESSLY NOT to give Ellison's ego more money. Monty and pals took a few years off MySQL but its obvious Oracle isn't moving the product forward.
The BIGGEST reason for using ANY spinoff is that Oracle is gradually making the distribution of "original MySQL" more onerous for Red Hat, Ubuntu, Zend etc. Oracle eats its partners more violent than Microsoft ever did. So it's just bad business to base YOUR BUSINESS on MySQL remaining on its "graceful" terms much longer.