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.
NM-Mint Foil - $1.30
Lightly Played Foil - $1.20
Moderately Played Foil - $1.00
Heavily Played Foil - $0.90
Damaged Foil - $0.70
NM-Mint Foil Non English - $1.30
Lightly Played Foil Non English - $1.20
Moderately Played Foil Non English - $1.00
Heavily Played Foil Non English - $0.90
Damaged Foil Non English - $0.70