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Allow bounty to be set with reputation from another site?

I had a pressing database question, so I posted it on stackoverflow.
However no useful answer came and I offered a bounty.

Answers came along with the remark:

This is better asked on dba.stackexchange.com

And indeed it was, however I have no rep on dba to reward a bounty whilst I have oodles of rep on SO.

Why can't I use my rep from SO on another SE site?

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