This could go on as an endless discussion..
What you might perceive as "Powerful" need not necessarily mean "powerful" to others. As Aman has repeatedly said, Buy a license for the products that you want to use- have enough CPU, RAM , storage to manage multiple databases.
It is best to contact your local sales representative or contact Oracle Support and get their advice on the licensing.
My point is that I want Aman to agree that I can save money by doing that idea?
Yes - you can save money by doing that.
Even better - you will save even more by not having to spend money on fancy clothes, cars, dinners and other things that all of us who are NOT in prison for stealing from Oracle take for granted!