not really. their value is pretty stable,
I highly disagree, if you would like proof : try to trade someone a decent long for their epic plushie. No one will accept.
then why do most accept on the page? they have had a pretty steady worth for a while. their demand is high for some but low for others. some people dont want epic plushies, they may be going up, but not almost double their worth! (good long collar is basically double the worth) if anything they have gone up maybe a short collar at the most.