3 star gives you 1000 Ebay Points PER RESERVATION.

4 star give you 1500 Ebay Points PER RESERVATION.

If you booked 20 nights as 20 separate 1 night reservations - and informed bidders can be almost sure of getting the same hotel by bidding the exact minimum for that hotel - that would be $200 if they were 3 star hotels and $300 if they were 4 star hotels.

Or - much better value - transfer to Asia Miles. Wait till you have booked a total of 36 reservations at 1500 points each - transfer to Asia Miles through Points.com - and you have enough miles for a free BUSINESS CLASS TRANSATLANTIC ROUNDTRIP on BA or other partners; only costs 60K Asia Miles for mid-western or eastern USA.