Almost everyone is super hyped that someone finally likes their work enough that they actually want it, let alone actually want to pay for it. So they undervalue their work and sell it for peanuts. I sometimes see work priced so low that it barely covers the supplies. They might sell a few but don't want to raise their price as they get better. Get a few people doing this and it becomes hard for legitimate creatives to sell their work at higher realistic prices.
Then there's overseas creatives. Some can do phenomenal work but you just can't compete with their prices even if they're pricing realiatically for where they live.