For a lifetime license incl updates forever that seems quite reasonable to me. It's a bit over a year of Netflix.

In fact, given that it includes perpetual priority support (within a business day!) I expect the author's gonna change that soon, once he gets one of those infinitely demanding customers and realizes what a terrible mistake he made (inf support for a one-time payment, oops!). So better bite while it's hot!

The €40 option for one year of updates is a lot more economical and is still a perpetual license for the software itself.