Yes someone already went over all the ways there are to light a fire but the point of kindle is it's meant to be a convenience magic. 500 is too costly because of the fact there are several other options for fire lighting. Maybe you don't use it but I absolutely hate firebrands so if the fire pits go out I will juse kindle to relight even at 500 but I still think the cost is way too high.
There could be torches coming out of my ass and I still might use kindle at least once a day.