What I’m about to say is my own business: sales, promotions, black friday offers, etc. are made by companies that employ developers or even just sell products they did not create. The revenue is high enough to operate with sales, financial and legal staff that they can discount to get new customers to inflate sales.
Jam Origin is a craftsman who develops a unique product for musicians and sells it on his own like a big one. He sells his product for the real value of his work, he can not afford to be a carpetbagger and I sincerely believe that is not his intention.
Besides, the price increase of the software is quite normal: it has not increased for years and not only does it bring an improvement of the tracking performances, but it also includes new functions and MidiMachines, new evolutions of the proprietary plugins, which add to what was at the beginning a simple audio-to-midi converter with a few plugins, most of which being available for free.
All softwares upgrading with new tools see their price increased accordingly and most of them often charge this upgrade to their users of less than 1 year, 6 months, sometimes even 3 months.
Midi Guitar, on the other hand, has not increased in price for years and the license is for life! So users who have had a license for years appreciate the free updates today and those who buy the license today will in turn appreciate the future free updates.
This licensing policy is to the credit of those who develop software to make users happy and not to make money like the giants of this business who underpay development workers and depreciate the value of their work by selling off their creations.
This software is unique, it has few if any equivalents, so if you think it is worthwhile, you are willing to pay a reasonable amount for the service provided.
You can also read here some reactions about the price increase of Midi Guitar: Price increased by 50%