Why choose Oracle?

Why choose Oracle?
                               “Why Oracle?” This was the question that everyone asked when Oracle was displacing the mainframe DB2 systems back in the early 1990’s. Back then, Oracle had carved-out a niche has being a versatile database, not constrained as DB2 was to MVS and Informix is to UNIX. At the time, I was charged with making a “buy” decision for the new “mini computer” databases, and I’ve been intimately involved in this question for decades.
Oracle is the not the most elegant database, and it’s not always the fastest platform. Oracle rose to the pinnacle of the IT world on other virtues. Rather than wait for the end-user community to react to market changes, Oracle took a proactive approach and often introduced features far-ahead of the market demand. I remember when Oracle 7 was undergoing beta testing and we wondered about the new “cost based optimizer,” “hash joins,” and bitmap indexes. In Oracle 8, we replaced EBU with RMAN and learned about partitioning and star transformations. And so on—high anticipation with every release.
When managers have to make a “buy” decision for database software, they just go with the market leader. Isn’t that enough rationale?
-By Burleson
That's the qualitative advantage, but there are also quantitative differences. In North America, certified individuals earn 7.5% higher salaries than those without certifications. Worldwide the difference is even greater, with 14% higher salaries for certified employees.
-       By TechRepublic