The end game of the OSRS GP economy is realizing that bond prices and consequenly GP inflation will only go up in time so you better buy them now in bulk.

If you grinded GP for a bond or an item it would be for the average player 70 cents to 1$ per hour. Even with the HIGHEST money maker in the game it would still only be around $8/hr.

For example a twisted bow on average takes 1100 hours to get where you can get that with 32 hours at any job at $22/hr nowadays.

$22/hr would be 31 million GP per hour if translated into USD.

You should play osrs for the cosmetics, non tradeables like fire, infernal, skill capes and quest capes though among the other fun activities.