If the value of the bug payout is equal to the grey market payout, why would I ever sell it to Google? I could sell it on the grey market and not pay taxes on t

If the value of the bug payout is equal to the grey market payout, why would I ever sell it to Google? I could sell it on the grey market and not pay taxes on the sale, or worry about cumbersome reporting requirements. Google plays a dangerous game with this logic.