As a non-legacy, I don't agree with this at all, because one of the things I like about this game is how immersive and dynamic the lore is because of those players that were actually there to experience past events that took place before the story even began, so to speak. To me, that's something special that this game has that no other mmo on the market can claim rights to, and is a symbol of how close XIV came to total failure and how well it's bounced back since. That being said, the legacy tattoo has a link to the lore that, if tossed up on the cash shop, would cheapen both the symbol and lore behind it as well as being a slap in the face to players that experienced 1.0. I hope SE never considers selling it.
I wouldn't mind having a body tattoo option in character creation/aesthetician, however. As long as there's nothing similar to that particular tattoo included in the options, I think it would be a great idea and would allow us a little bit more originality with our characters' looks, especially if we could edit the color of the tattoos and/or even layer them. More customization options is always a good thing.
One thing that gets to me about threads like this though, is that I don't think anyone should reserve the right to tell other people that they "don't deserve" something, regardless what that something is. It's rude and condescending and reeks of special snowflakeism. If that player knew about 1.0 and made a conscious decision to not play, then yeah, maybe they don't deserve it, but only because they had the opportunity and didn't make the effort. But how does anyone presume to know that a player who wasn't able to play during that time for whatever reason, or didn't even know the game existed, wouldn't have made the effort to be involved if given the chance? No, that person doesn't not deserve it, they simply missed out.
(This goes for any exclusive item, not just legacy things. And no, I don't believe that they should always be given the item or a chance to get the item just because it's unfair they missed out, I think that with some things if you miss out you just miss out and that should be end of story. I just don't equate someone missing out on an opportunity due to things beyond their control to them automatically not deserving the rewards. Not deserving implies that they didn't and wouldn't even try if they had the chance.)