This is pretty much a standard for swing trading. Buy the ask, sell the bid. Get in when you want in. And get out when you want out. Any size gain is a win and wins add up. Wanting to squeeze out more then is available the second you make a entry/exit decision can actually cost you money in the end. Just like the example I just posted.
When trading always be happy with what you get. Wanting more causes using emotion, not logic.
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