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Well, because you sat there and asked the guy questions about mopeds for hours and hours, and asked him to print up and give you detailed moped schematics, and even called him at home in the middle of the night after you had a big fight with your mom about whether or not a helmet would protect you from head-smashing incidents, and asked him to get out of bed and send you all the pertinent crash-related statistics on helmet safety right away.
In short, you wasted a lot of his time, so you owe him a little something for that.
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