so everytime we get a bitcoin payout from our pool we need to go look up it's value on bitcoin charts at the that time to figure out its worth. its going to be an accounting nigtemare.
It is not an "accounting nightmare" it is a simple program, sort of like this one which already exists one day after the IRS ruling.
https://bitcointaxes.info/No doubt people can and will create more such programs. These are not even hard programs, they would work fine on an 80s vintage PC.
This does not work for wallets, it only works for trading.