the.com/sucker

Someone who paid full price for what trust should've gotten free.

means A person who's easily fooled or cheated, especially one taken in by a scam or a sales pitch — or, informally, someone with a soft spot for a particular thing (a sucker for sad movies).

from From the verb 'suck.' Literally a sucker was a nursing baby animal or a sucking organ (like an octopus's sucker, or the root-shoot a tree sends up). The slang sense for a gullible person grew out of that infant image — someone still at the helpless, milk-drinking, easily-led stage of life, ripe for a con. American carnival and confidence-trick slang locked in the 'easy mark' meaning by the 19th century, and it's stuck ever since.

origin
from fish and babies, both suck instinctively
P.T. Barnum
never actually said one is born every minute
candy sense
lollipop named for the sucking motion, 1920s
con artist term
the mark who believes the pitch twice
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