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No it's just pay to look cool, there aren't any affections if you go with default skins or with a 30k$ skin :)
Just something like a prestige thing, and maybe if you're a camper and or ninja-defuser the first choice wouldn't be for example the neon-revolution because of it's glowing colors :D
But it's everyone owns choice if they want to play with or without skins :)

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