New skill?

Alright so i have an idea for this skill,
its called merchanting

Okay, so the basic of this skill is:
you start by talking to someone in a town, he gives you the task to go to another town.
You buy stuff from there
then you run to another town where you can talk to a npc who gives you exp and gold for selling the stuff you carried to there,
example: you start talking to a guy in edge and you need to run to varrock.
When you run to there and you talk to the npc you get exp depending on how much you walked.
You get gold depending on how much you spend and how many you bought

-optional-
when you levelup you get like cars to transport more goods in it and where you can get more exp and more gold.

Maybe someday

why not spawn the transport for golden weapons when you are delivering the goods you get attacked by a renegade and you can only kill them with golden weapons