I do prefer an NES to have its original pins, as those replacements are junk and tend to wear out quick, leaving it in an even worse state than it was with the original pins, but that said, a working system is still better than one that doesn't work. Trust me, you can clean the absolute heck out of your NES and carts and still have it barely work if the pins are bent out of shape. I used to have an NES like that. And I don't expect every random person who has an NES to have the desire or know-how to open up their NES and bend the pins back into making a decent connection, so I can't blame people for opting for clones or replacement pins or what have you.