Arrows are expensive, but that is the life of an archer. The benefit is archers can do a lot of nice damage and neat things with arrows. Hopefully this makes it worthwhile.

It can be troublesome to run low on money to buy arrows. I'm an archer and stopped going out because I ran out of money. But when someone wants me to tag along I ask if they can give me some arrows, and they are usually quite happy to do so.

Maybe if you are in LS that wants to do some activity that requires arrows you can ask if the the party can help you cover the cost of the arrows. Does not seem unfair. They give me arrows, I give them dead monsters. Everyone is happy... except the monsters...