Yeah I 100% agree with this. And each time you start the atv it should use like maybe 10% of the battery? It should also slowly charge the battery when running. Even if you need to repair the alternator before it does this id be ok with it. I think the battery's main purpose should be used as a way to punish you for leaving the headlights on and not as a "second form of fuel".
Viewing post in Humble ATV battery suggestions
A 10% tax on start is exactly what I was thinking too. Maybe the alternator could be a purchasable upgrade. The only problem I see with the alternator/charger route is they would need to be cheap enough to justify actually buying them because once you get the solar panels you basically negate all of these things entirely, including the battery itself (which seems a bit overpowered honestly).