Sweet Gem Berry is not a fruit so it cannot be placed in the Keg.
Vine/Trellis/Tree Crops are more profitable because they don't require replanting seeds and typically have a faster regrowth rate than the growth rate of the original crop.
| Ingredient | Duration | Increase | Gold/Day |
|---|---|---|---|
| Starfruit | 7 Days | 1,500g | 214.3 |
| Wheat | 1 Day | 175g | 175 |
| Ancient Fruit | 7 Days | 1,100g | 157.1 |
| Hops | 1-2 Days | 275g | 137.5 |
| Pumpkin | 4 Days | 400g | 100 |
Wheat Seeds: 10g Starfruit Seeds: 400g
After factoring in the cost of seeds, converting Wheat into Beer will net you 165g/day compared to 157.1 from both Ancient Fruit and Starfruit but the biggest difference here is processing time. Wheat takes 4 days to grow but processes in a Keg in 1 day so it will take 4x the amount of crop space to keep up with the Kegs (4:1 crops to kegs -- Keg Ratio) compared to a the simple 1:1 Keg Ratio for Ancient Fruit Wine.
The problem with this is that making Beer becomes a daily tasks instead of leaving Wine to a weekly tasks -- that means less time doing other things in the game.