Their pricing model is based on extracting as much money as they possibly can from a customer for every subscription. The lifecycle of these hosts is very short, so the agenda is to price high while offering very little value, and eventually ditching and creating a new site (effectively making existing memberships useless).
This will continue year on year because the users of Avaxhome are hostages to their whims.
Also, the prices you see are not what you pay. For the 90 month subscription, for example, you will pay $50 (because $10 is added on top as 'fees').