A 50.00 item marked up to 100.00 is a 50% gross profit margin. If you were to take a 10% discount on that item it would be 90.00,20% = 80.00 30% = 70.00 ect so 50% off makes it 50.00. Thats a 50% profit margin not a 100% profit margin. It makes it look like they are getting a better mark up than...