> Rather a situation where data has to travel further, through more nodes from source to destination. Shouldn't a logical system allllow that data to cost more?

That's not what the cost structure looks like for ISPs, so you would need a pretty good justification for making the price structure look like that. It doesn't necessarily cost the ISP more to have packets travel across more hops within their network; it's more likely to reduce the ISP's expenses by reducing the amount of traffic they have to buy transit for. Where a packet is within the network really only matters and becomes worth tracking when a link gets congested.