Your pricing scheme is extraordinarily complex and the page does the poorest possible job at explaining anything. Heck, it doesn't even mention that RAM is your discriminator - it simply implies it as if that was natural.
Moreover none of the terms are explained (what is "Vertical Scaling", what is "Proportional to application memory")...
There is not even a calculator/slider to get a rough idea of actual cost without engaging in Excel-gymnastics.
You should seriously get outside help for this.