I received 1500 EUR for a downgrade on LH from business class to premium economy on a daytime flight FRA-DXB. Ticket was bought with award miles.
So $2000 ORD-DXB to Y... No way I'd even consider it. Ticket price of J is around 25,000 AED return, so I'd expect at least $3000 for the downgrade (which I'd still not accept I think)