There is/are lurker(s) on this forum who likes to offer more for sellers, instructing them to close bidding outright, as it is obvious, in a public auction someone among those watching, could have offered even higher for the domain with a potential.
For some unbeknown to me reason, many sellers are so naive and weak nerved, so they can't stand a quick flash of money in their face. Lured with a false temptation they pull out completely.