Hunts, built in wait time.

[saeedaisspecial]

Your argument's sillier. Money can't be shared? Figure that one out.

Okay, time to explain it as if I had to a monkey.
You see a $10 note on the floor, you pick it up. No one else can pick it up because you have.
You find a B rank hunt, you start to kill it. Others could also take part and earn seals even though you are killing it currently.
One copy of the money in your analogy exists. Multiple "copies" of Seals exist for everyone that takes part.