This is a great idea. I wrote a little JS snippet to paste into your browser's console to do this automatically. It iterates through all comments and upvotes any with a salary range / salary in the job description. Happy to make edits if you find a post doesn't match and it should—or vice versa. Upvotes are limited to 1 every 2s.

    var r1 = /(\$|£|€|)\d+(k|K)/m
    var r2 = /\d+-\d+(k|K)/m
    var r3 = /\d+(k|K) EUR/m
    var candidates = [r1, r2, r3];
    var linkQueue = []
    var comments = document.getElementsByTagName("tr")
    for (var i in comments) {
        var comment = comments[i];

        if (comment.className && comment.className.indexOf("athing comtr") != -1) {
            for (var j in candidates) {
                if (comment.innerHTML.search(candidates[j]) != -1) {
                    var linkElements = comment.getElementsByTagName("a");
                    for (var k in linkElements) {
                        var link = linkElements[k]

                        if (link.id && link.id.startsWith("up_") && (!link.className || (link.className && link.className != "nosee"))) {
                            linkQueue.push(link);
                        }
                    }
                }
            }
        }
    }

    var identifier = setInterval(function() {
        var link = linkQueue.pop();
        if (link) {
            link.click();
            console.log(link);
        } else {
            clearInterval(identifier);
        }
    }, 2000);