It has less to do with what miners decide and more to do with how impatient people are. E.g

If there are 10k transactions pending you can always get ahead in line by paying more. Or if there's no rush, pay less. If the 10k transactions are all set to 1 sat/vbyte you dont have to pay much to get confirmed faster, but if they are outbidding each other it can quickly climb.

Lightning generally avoids this.