bitcoin vs bitcoin cash vs bitcoin gold vs bitcoin segwit2x. Each fork with the 'bitcoin' pre-fix starts to dilute what bitcoin is arguably. I think this is a natural consequence of being the market leader, but I feel it creates too much confusion to the casual investor ... the difference between these separate cryptocurrencies. I also feel that although the code may be similar at first, each passing day the respective code bases will continue to diverge such that they are no longer "similar" in the manner their names suggest and therefore the forks should be re-named/re-branded to something else instead of piggybacking off the parent fork.
you could argue it gains value through the "airdrop" phenomenon. The idea that owning bitcoin comes with a fork dividend.
the fork dividend is the "free money" you get when you are a holder on the existing chain and the fork gives you an equivalent amount of new coin