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Is it possible to buy reputation on stack overflow? It seems that the people do answer more efficiently if bounty is offered :)
Simply answer is: No, you can only earn reputation points.
A few posts on MSO that are relevant:
How to Buy Rep Only for Use as a Bounty?
Offering actual money as a bounty?
Pay money to SO for quick support
And note that this is Meta Super User, not Meta Stack Overflow.