Old Customers getting gouged and new customers offered rates at 50%! looking to switch

Hello, why is it that Comcast decides to jack up the rates on existing customers and offer new customers rates at 50% less?  I have been a long time customer and would like to chat about the "current offers".  I may be at the point of switching providers.  Comcast is not a monopoly and maybe a few less quality, long time, paying customers is what management needs to realize you can't neglect your core customer base.