Add Grace Period (AGP), a five-day window during which a newly registered domain name can be deleted or dropped
If the above is true, you can return domain on the fith day. Wouldnt a proccess of trying to buy ALL dropped domains (sure you will miss a lot) on credit card. Cards have a 28day grace so would cost you nothing. Keep them for 4-5 days and return all domains which dont make anything. Or better yet keep it rolling and return all domains regardless as it cost you nothing in the first place pocketing 5 day ppc traffic for free.
20,000 domains a day (very bad catching)
average £0.001 income per domain a day
£20 a day
making £100 a day income for free over a rolling 5 days period
(its been a long day so im expecting some pointing and laughting)