The NFT entitles you to dividends as long as you own it. The rules are described here: https://t.me/TTAXannouncements. The maximum number of NFTs without a % mark is 50, and with a % mark is 6. The collection is complete, and no new NFTs will be added. Apart from the dividend rules, each NFT can have a completely different valuation, regardless of the dividends it provides. You will determine their uniqueness.