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Say a person is willing to spend hours standing in line just for some useless freebie, or spend hours negotiating a one dollar discount on a 100-dollar product, or things like that, and be very happy about it.
What is the adjective or term for the person with such behavior, if there is one?
Your initial question used two very good adjectives: petty and trivial, so good job! I would add niggling, piddling, penny-ante, and picayune. The last two have interesting sources and histories.
He's always niggling over small details.
Of those, only four rather piddling victories went the liberals’ way. — The Economist, "Justice Kennedy is retiring. What happens now?," 30 June 2018
I didn't want to seem picayune by criticizing.
Other words that come to my mind are neurotic, spendthrift, and cheesy. These have differences in personal judgment of the character of the person, namely a little bit crazy or "off" for neurotic; cheap and miserly with money for "spendthrift," and of poor quality taste and character for "cheesy."
He seemed a neurotic, self-obsessed character.
The spendthrift managed to blow all of his inheritance in a single year.
