A Big Secret
Now let's discuss box B. There is no buyout price. The seller is saying, let the market determine the final price. I think this is an anti-pattern for non-scarce items. If we searched for siege engine, there's probably a ton of them. Even if this is the lowest priced item, the seller is making the winner wait 17+ hours to get it. This is slow money and I stay away from it.
Own Box A
One item that I owned box A for was Radiant Enchantment Rank 5 (RE5). I could always sell those consistently. Before the level increase from 60 to 70, this was a monster.
How did I always move RE5 before the patch? I would sell radiant enchantments priced at 3,000 astral diamonds. Because of the this approach, I could never keep any RE5 stock up for a long period of time. Most people mentally had the priced fix at 3,500 AD, but for me I was happy with 3,000 AD. I will share why I was okay with this in a bit.
Let look at the math. For 10 sales, I net 30,000 AD and give up 5,000 AD. For 100 sales, I net 300,000 AD and give up 50,000 AD. You may say, whoa, you are give up 50,000 AD for 100 sales. I can rationalize this behavior with an expected value (EV) calculation.
The EV calculation for A and B is:
A = 3,000 AD * 100 = 300,000 AD
B = 3,500 AD * 60 = 210,000 AD
Yes, the math is fuzzy and I'm ignoring certain statistic, gaming theory, and other importance variances. But, the math is good enough for this situation. The math is justifying why you should aggressive price items at a discount. In this case, I'm pricing RE5 at a 16+% discount (3500 - 3000)/3000 or 500/3000. Because of how I price, I'm gaining 90,000 AD (300,000 versus 210,000 AD) for every 100 RE5 I decide to sell.