While that's reaaaally cheap for a 600+ cc bike, consider that the price difference is something like 50% of the total price of the Ninja 250R...
For a beginner, masyadong malaki at malakas yata ang 650R... The 250R is already fast, but at least in terms of size and weight... and, most of all... power, it's still manageable for a relatively new rider... it just has a little more torque over an underbone 150, and the torque curve is flat... The power comes spread out over a very wide rev range... whereas with the 650, a small twist of the wrist and...

...it makes over twice the torque of the 250R at just off idle...