why is the green one more expensive?

price is depends upon the availability on the market.

Can the buttons be used to bind any sort of macros (shift+F1, etc) or can they only switch between 1-6 and numpad 1-6?

It can be used to any sort of macros, like you say the shift+F1, I special try to do it. But you need to install the Razer synapse 2.0.

can the buttons bind to any key?

From what I can tell yes. I kept mine the same for buttons 1, 2, 3, 5, and 6 but have my 4 button binded to ~ When you have the Razer software for it too, there are like 8 different configurations you can save, and there is also another switch on the bottom of the mouse tochange the buttons on it from the standard number set to the number pade numberset.Hope this helps.

Brand	Razer
Item model number	RZ01-00750200-R3U1
Hardware Platform	PC
Item Weight	1.49 pounds
Product Dimensions	3.19 x 2.76 x 1.81 inches
Item Dimensions LxWxH	3.19 x 2.76 x 1.81 inches
Color	Red
Department	mouse
Manufacturer	Razer Inc.
Language	English, French, Spanish
ASIN	B007WTAJTE
Is Discontinued By Manufacturer	No
Date First Available	May 1, 2012

Razer Naga Hex MOBA PC Gaming Mouse - Red

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