Very pricey to maintain.
But, yes, sell them to collectors.
The Bundeswehr can't/won't maintain their own Leopard 2's, coupled with the poor performance in combat by the Turk Leopard 2's selling or even giving away any version of the Leopard is a tough sell. Bad decisions by both the Canadian and Australian politicians. They should have danced with them that brought them to the dance, the Gringos.