IMO this is not the best indicator of quality - price, that is. For example, Calmacil - who is known for good [and often EXPENSIVE] latex weapons: their price ranges are rather - for a lack of better words - dynamic. For example, a lot of their daggers are anywhere from $50 - $75. My friend has a katana from them - cost him nearly $250 when he got it about 3 yrs ago. One of their claymores [at 48" long] comes to $195 USD, which is more than the sword that spurred this topic, but just a bit cheaper than your dagger.
And on the other side of things, we have unknown brand names, whose stuff pops up on e-bay
[like this] <---- that, I can say from experience is a piece of crap durability wise..