As it currently stands gabeedle’s shop offers 3 revival items: reviver seeds, revival herbs and Max revives.
Revival herbs and Max revives are pretty rare and pretty powerful items giving a reason for player to consider buying them, but reviver seeds are pretty commonly found and sold in many kecleon and player shops all over pmu.
Golden apples are currently only obtainable from end boxes and silk boxes, which leaves big apples as the best purchasable food item. Putting golden apples in gabeedle’s shop would allow players to farm golden apples more readily and give the ability to get more powerful belly items, which may also take a tiny bit of wind out of no belly strategies and provide more options for varied gameplay.