Call it selfish if you want and I could just as easily call what you want greed if we really want to start calling names and labeling people, but you should not be able to buy anything that you want. For whatever reason you were not a part of the game during the time period that these things were available, so you do not get things that were available exclusively during that time such as the marking, the gobbue, the dalamud horn, white ravens, etc.
Some promotions are one time only, deal with it because it'll happen several times throughout life. The legacy marking is for players 'legacy' or otherwise who were present during the 1.0 version of FFXIV and unfortunately many of you were not. If you had been, great that would have been wonderful and I'd not think twice about you having it, but you weren't.
A lot of people are being snide about people saying what others 'deserve' but the truth is the players didn't decide who was deserving. Square Enix did, because they were the ones who created the conditions behind getting the marking, and some of you do not meet their conditions.