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Ouch. And about two weeks ago I decided to trade some of my Ethereum for Monero, Decred, and Golem.

Might be time to get back into ETH and LTC

That's not how it works. You are wrong

That trade spot is most likely held by a hundreds of other minnow traders.

For example, Max opens a buy trade at 0.0012000 BTC for 5 QTUM
Phil and John also opens a trade for the same price with 20 and 30 QTUM respectively.

So, the total trade for that position which is 0.0012000 becomes 5+20+30=55

Hence you see a trade like this, Bid 0.0012000, Total =55 x 0.0012000, Size 55 , and SUM Trade1 Toal + Trade2=Trade3 value total and for the third postition it would look like Sum Trade 3 value+ Trade4