It's not worth it to level up Fire Bolt?
A 1/3rd increase in MP cost for a 1/6th increase in damage. Since it scales linearly, assuming there are no extra bonuses at any particular level...
Lv1: 300/10 = 30% damage/MP
Lv2: 350/13 = 27% damage/MP
... (250 + 50 * X) / (7 + 3 * X), where X is the level of the spell. This graphs as a hyperbola. the value per MP cost never increases, only decreases.
Since it's easy to mash the spell button, there's no benefit to increasing the level.
Don't upgrade the homestead (or stable) without scrolling over it (to give space for the cows and horses to go to), because the cows and horses stay in place while scrolling.
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