We have a massive problem with undercutting. Maybe you haven't realized that the overall prices are quite low. Sale offs campaigns tried to force creators raise their prices in order to stop unfair competition, but unfortunately it seems that most of us aren't increasing our prices in a permanent basis. I don't see how CGTrader can control this without incurring in dishonest behaviour towards creators. Myself as a seller have opt out of the sale-offs as there are a lot of them during the year and it doesn't make sense to me, I prefer establishing fixed and hopefully fair prices for all my products, so please don't blame to all of us sellers.
Best regards.