tampermonkey script to do just that (would be nicer if HN could pop the karma into a span with an id :-) )

// ==UserScript==

// @name hide HN karma

// @namespace http://tampermonkey.net/

// @version 0.1

// @description hide HN karma

// @author You

// @match https://news.ycombinator.com/*

// @grant none

// ==/UserScript==

(function() {

    'use strict';  

    if(document.getElementById('me') !== null){   

      //hide karma 

        Array.from(document.getElementById('me').parentElement.childNodes)  

            .filter(x => x.nodeType == Node.TEXT_NODE)  

            .forEach(y => {y.textContent=' '})  


        //remove link to profile page

        let me = document.getElementById('me');  

        let newme = document.createElement('span');  

        newme.textContent = me.textContent;  

        me.parentElement.replaceChild(newme,me)  

        ;  

    }  

})();