Bro, Hollow Knight was developed in 4-6 years, with 4 people, and a budget of 40-50k dollars, a game that lasts 50-80 hours, Bones in these 2 years has generated at least 80k dollars, from a game that has been in development for 7 years, a game that if you skip the text lasts less than 5 hours, a generic game that wouldn't be worth it if it weren't for its porn content, you tell me it's a simple game created in RPGM (no offense to good RPGM games, there are some, but this is not one of them) are they going to cost the same as a game developed, for example in Unity?
Bones has been able to hire a small team of people for years, whether his greed prevents him from doing so is another matter.