Similar to what others said, the "1st edition" stamps in pokemon and Yugioh were for the first print run of the new sets, then it goes into unlimited (or whatever their print run maximum was) - it rewards early adopters that bought on launch day!
I put a 👎mainly because of running both at the same time (alpha and non-alpha).
This ties into previous discussions in the community of having ALL D1sks priced the same and the first "XX amount" for the Megas and Standards will get Alpha stamps while supplies last. After those have been bought, the Alpha Stamp is over and and the normal d1sks continue seemlessly.
This would push everyone to buy right away without any price difference - and everyone lnowing Alphas will hold more value long term. Unfortunately people might be buying thinking they will get Alphas and will be very disappointed when they don't get them.
But there was alot of discussion why Alphas had a higher price point so I will not re-hash those points now.