Write a Python script to simulate a complex probability game and calculate the expected value empirically.
Simulate independent rounds using three fair six-sided dice. A triple pays 20 points, a non-triple with a sum of 10 pays 8 points, a sum of 7 pays 5 points, and every other round pays -2 points. Accept rounds and seed, use the seed for reproducibility, and return the average payout rounded to six decimal places. Implement def simulate_game(rounds, seed):.
def simulate_game(rounds, seed):