thank you for your feedback, although I do not think implying a "move towards pay-to-win" is a realistic assessment of RF4 on your part.
The game is based on an economy system that strives to keep players engaged and always provide new goals. As new content, and thereby new income possibilities are added, the item prices need to be rebalanced as well.
Russian Fishing is not a static game, but is constantly evolving. While that provides players with constant new content, it also means you will experience the rebalancing, that is part of every game development process, in real time.