Do I understand right that you can only buy 6 items a day with the seed and with the gobblers i could create up to 24 a day?
The seed offers 4 purchase options, one corresponding with each gobbler. Purchasing the option that takes bloodstone dust and dragonite ore shares the cooldown with the sentient anomaly, so if you buy all 6 from the seed, you won't be able to use the anomaly anymore, and if you use the gobbler, you won't be able to purchase them from the seed anymore. You can get a total of 24 fluctuating masses either by using all 4 gobblers 6 times, or buying 6 of each listing from the seed (or by doing a combination of both).