Commander creatures you own have "Whenever an artifact or creature you control is put into a graveyard from the battlefield, each opponent loses 1 life."
You give your clients what they want at a fair price. What happens after that is none of your concern.
Near Mint - $0.20
Lightly Played - $0.10
Moderately Played - $0.10
Heavily Played - $0.10
Damaged - $0.10
Near Mint Spanish - $0.20
Lightly Played Spanish - $0.10
Moderately Played Spanish - $0.10
Heavily Played Spanish - $0.10
Damaged Spanish - $0.10
Foil Prices
Near Mint Foil - $1.90
Lightly Played Foil - $1.50
Moderately Played Foil - $1.40
Heavily Played Foil - $1.20
Damaged Foil - $1.00
Near Mint Foil Spanish - $1.90
Lightly Played Foil Spanish - $1.50
Moderately Played Foil Spanish - $1.40
Heavily Played Foil Spanish - $1.20
Damaged Foil Spanish - $1.00