It's not just the money; I bought Iamgold to buy into West African gold mining and exploration -- not generic worldwide mining. Today I voted to accept Golden Star's current offer for Iamgold. An all-West-African Golden Star + Iamgold makes sense to me whereas Iamgold + Wheaton didn't.
(I also have some Wheaton (WHT), separately, but am not so keen on Coeur d'Alene's (CDE) current bid for Wheaton.)