DDG has been solid for me, and I rarely use g! anymore. I certainly can find better things to do with a hundred dollars than spend it on something I don't need and that other services do just as well for free.
How much money do you spend per year that you wouldn't otherwise due to brand advertisements? Answer: you'll insist it's 0, but it's impossible to know.
How much money do you spend per year that you wouldn't otherwise due to clicking one of the first few links and paying more for some service, often without realizing it's an ad? Again, the answer is that it's impossible to say.
Google is commonly said to own a "money-printing machine" on here. How can they print all that money without extracting any from you?