Definitely die cracks. Added value? No. Added interest? To collectors like me, yes. I'd rather own a cracked-die coin than a pristine one.
Yes, I believe it is! Looks like a spiked head! Nice find! Added value? Yes, probably for error collectors.
Yes die cracks. Added value - maybe to the right person. I find a lot of 95's with die cracks. I toss em back.
Yes. Remember the crack is on the Die itself and not on the planchet being struck. When you see a raised line (crack) it's the metal flowing into the crack that occurred on the Die.
Small cracks don't add much value as said by others. When you have large bold cracks, collectors will pay a bit more. Some folks love them and others won't buy them. Still fun to collect.