For me ChatGPT has already proved to be a time saver. A couple of examples:

1) I was dealing with 2 sets of data in an unfamiliar language. There was an overlap of the data. I needed to see the unique data for each set. ChatGPT gave me the solution for this.

2) I needed to interact with an RSS feed of a website. There wasn't an RSS feed for the data I was after. ChatGPT generated a program retrieving the data via the website's API and then generated a second program which converted the data to an RSS feed.

For the increased productivity, I can see how $100/month can be within developers' budgets considering their salaries.