CGTrader has a system where the better you do, the more you get payed. Which is funny since you need the money more in the beginning and its overall just dumb. I think it should be a flat rate for everyone and since they take such a huge chunk, they should be acting more like our agents than just a website. lol
Right now, for me, CGTrader takes 30% of my price, Paypal takes a tiny bit for processing fees and there is a section in my sales that says "after taxes" but thats just the processing fee. Maybe the processing fee includes taxes. I don't know.
So a $10 sale gives me $6.67. Both yours and mine leads to about half what the sale is. Most likely for you, the taxes and processing fees are taking a larger chunk since you have a larger sale. Or maybe CGTrader abides by each country's rules making your taxes higher than mine. Or maybe there is more at play. I don't know but those are my guesses.