The 0.05 aren't fees. I think they were test sends to make sure the address and all else was ok. After a couple of confirms the remainder was sent to the confirmed address to bring it (usually) to a round 5k.
Doesn't explain why 5k when that wasn't the lot size.
Doesn't explain why 5k when that wasn't the lot size.
Maybe some bidders won several lots and that's how the buyers wanted them.
Maybe, but that means all the successful bidders won a lot of 3k and a lot of 2k (except one lonely single 3k and an as yet unpaidfor 2k) which rather implies that "all the successful bidders" is a very small, if not the unity, number