...i want to cooperate with you.
(Also, read: "I want you to cooperate with me")
Realistically, informed people are not likely to pay +$100 dollars for a scope with the same hardware as a cheaper one; even if they are incapable of changing the firmware! It seems you have three options:
1) return the scopes to Rigol and negotiate the best fee with them (if they care);
2) Just sell the scopes for the going rate (i.e. a DS1052E + $50);
3) Make up the loss by selling it together with some other equipment that people would be interested in.
(Consider also that currency conversions, import taxes and postage all add up as far as the consumer is concerned).
.o:0|O|0:o.