The fact is that Adobe continues to update the product and add new features. I'm not surprised you don't know this since you have cut the umbilical cord.

Those updates come automatically with frequent updates and bug fixes to the software. One doesn't have to pay to upgrade a Suite to get the updates. I remember my first Adobe purchase of Photo Shop. If I recall correctly, it was hundreds of $$$. Upgrades weren't inexpensive either. Revenue and profit are two different things. It seems Adobe's pricing model makes it far easier for people to get the software with very low cost, and get the updates at no additional cost.
Again, your description of being in "Adobe's clutches", "excessive profits" etc. seem overblown if you ask me... as though the corporation is sinister. Do you work for a competitor?
Of course, get and use what you like. For me, $10 a month is very cost effective. Worth every penny.