same reason duck that people make yellow and blue and pink gloves or put funny desgns on their sticks,its just one of those things that some people like to have.
im quite plain myself and dont go for fancy accessories but the camoflage gear may be helpfull not to scare fish away when your free diving but i think its more cause it looks cool or something,i dunno maybe im getting old or something

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top of de mornin to yeh