domain domain appraisals on domains like burgerz.com

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does anyone have any idea what domains ending with "z" instead of "s" like
burgerz.com, birthz.com, replyz.com, heirz.com, guestz.com, brakez.com I have about 70 of these domains and would like to sell them either individually or as a package.

Any thoughts would be appreciated!!!!
Thank you for you consideration in advance.

K. Silva