Non-competes should be a contract for a 'lengthy' severance pay period. It keeps the former employee out of the market, so the duration of the NC contract should be paid for at or above the normal rate of compensation + benefits. Depending on how it's booked for taxes / etc, E.G. if it's "You have to 'work' for us, and no one else, but on mandatory vacation, for X months, we'll pay you in full like that; and also do federal taxes etc."
Otherwise they clearly only provide damage to the employee and 'value' in extortion of that damage to the 'employer'.