HA - 20% Buyer's Premium plus Seller's fee. The bidders can decide to keep bidding until the total of amount included Buyer's Premium. If the bidder is trying to meet the average price within the current market value, the book is sold for $4620. HA keeps $770 Buyer's Premium and $385 Seller's fee that leaves $3465 for the seller. You can see the bids until you decide to bid or not.
Clink keeps only 10%. You won't know the bidder's secret bid until the time is expired. Sometimes, the price can be exploded. Sometimes, it gets less. I got DC Comics Presents #47 CGC 9.8 from Clink for only $547. Next month, other DCCP #47 CGC 9.8 was sold for $815. You may never know until the end.
Mycomicshop has great options.
You pay nothing out of pocket, only a commission when your item sells:
Auction
8% commission
Commission capped at $1000
Minimum commission $5 for slabbed comics
Minimum commission $7 for unslabbed comics, art, and non-comic items
Buy It Now
10% commission on sales up to $300, 8% on portion beyond $300
Commission capped at $1000
Minimum commission $5 for slabbed comics
Minimum commission $7 for unslabbed comics, art, and non-comic items
If someone bids your book under 3 minutes, it will extend to other 3 minutes. Other bid will repeat the extended time until the bidder stops to bid.
Now, you can see pros and cons here. Good luck on your house hunting!