I think you're looking at this the wrong way. You are receiving a > 50% discount for 3 years after which you pay the non-discounted price. If you'd prefer to pay full price from the start, I'm sure they'd be happy to let you.
The non-discounted price still isn't outrageous (I think?), but it's disingenuous to advertise a temporary discount as the price of a service. Unless you intend to only use it for 3 years, I guess. Maybe the cost savings do justify that.
