That is because some are older than others. An artist’s style can evolve over time, and an artist can also draw in multiple styles using different techniques.
I have charged 120 USD for a two-character commission before, but I can see why that might not be a reasonable expectation within this community. I thought splitting the price and allowing the client to pay in multiple instalments could be helpful, but regardless, I will take altering my prices into consideration. I also charged as little as 25 USD for a two-character commission in the past, and I was told I was underpricing myself a lot (though I didn’t raise the price then). However, I disagree with this:
Some artists tend to charge about the same or even more than me for a more simplistic art style and/or fewer hours spent on their art. I am by no means a professional nor is my art style the best thing in the world, but the amount of time and effort I usually put into my work is a big factor to consider when estimating how much my art is worth.