It’s cause the price increase is in the middle of the billing cycle.
If they raised the rates your bill would be so dam confusing to most people, they would get phone calls and it would just be 1 big bi**h session between the customer and the agent at Dish.
Better for them to keep the rate consistent on each bill.
You don’t want to see....
Welcome pack 1/3/19 - 1/15/19
$10.99
Welcome pack 1/16/19 - 2/2/19
$17.99
People get too confused and irritated as it is when bills go up