Customer retention

Can you explain why a new customer pays $50/mo. for 1 Gig Internet and a 25 year+ loyal customer pays $100/mo. for the same 1 Gig service? Both have 5 year price guarantees which means the loyal tenured customer(me) would pay an additional $3,000 over that 5 years. Does anyone else have the same question and wonder what you might get by following up with a direct message to customer support? You will get a $5 discount and be told you have the best package rate available. It’s an absurd way to treat tenured lifelong customers.