Data

So can someone explain to me y the hike n price if I can get the same 10 gigs od data on a $40 plan as with a $55 and $60 plan. Ok I knw the $60 has hotspot. With only 10gigs I don't need help burning the up. I thought the more u pay the more data I can get. So wats so unlimited about the $55 plan? I burned thru 10 gigs just since Dev 3rd. Frustrated.