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Even if they do, most people don't know that (seemingly) or don't trust that so they go to the 'right' side anyway.

Sometime, often actually. But not everywhere.

If the hose is too long it dangles on the floor, so they try to avoid that with springs holding it up, but I assume that costs extra.

maybe the long fuel lines are not long enough to reach around superawesomemegabigsuv4x4hummertrucks.

on a different note, i've always wondered why the bike chains are always on the right side.

Maybe bike chains are always on the right side because the right leg is typically the strongest and most dexterous, so it will cope better with jammed trousers.

I don't like to take the fuel hose over to the other side of my car because I don't want the dirty hose to touch the paintwork.