I said it before in the comments of an earlier chapter, but it's only a loser job among humans (or other "good" races). If the dude switched to the demon side, he would be a grand VIP. All skills have their own conditions and circumstances. For example, if you are a swordsman, you are a loser if the place is 100% peaceful with no conflict whatsoever, with not even perceivable potential for a conflict. You could still potentially make a living as a sort of hobby instructor or a performer, but there could be only so many such jobs available and it's not really what an average swordsman would want to be doing. Gaile is really fighting against his destiny.