If the rim is in decent shape, a wheel person at a LBS might not charge very much to look at and take care of any protruding spokes. If a experienced person hasn't looked at that wheel at least once in it's lifetime, then I'd further recommend it. A taco'd wheel is no fun and maybe dangerous if you are going down a twisty trail at even a moderate speed. It happens so fast you'll be laid out on the pavement before you know it if it's the front wheel. If cost is a issue for you, most all will give you a estimate or best guess. You can always walk away if it's too much for your wallet.

The fact you have a spoke sticking beyond the nipple suggests that someone has been willy nilly tightening spokes not knowing enough of what they are doing.