Collector demand for full boxes is clearly outpacing supply, while casual players are gravitating toward mid-tier products like ETBs and Blisters
For a very solid and highly detailed look at this aspect of MTG collecting, I recommend this fantastic article by Guo Heng Chin
I learned this the hard way when I tried to bring my favorite green and red dragon deck into Arena
Tokens can be Tributed or banished to pay costs or fulfill Summoning procedures (such as for the Summoning procedure of "Destiny HERO - Plasma" or "Unibird"), unless they would be required to be banished face-down (such as for the activation cost of "Hypernova Burst")
Except for the type of cards that power-up monsters or Field Cards, these cards are destroyed after use, and cannot be used again
Furthermore, both these cards also give players a significant amount of card advantage, which leads them to being played at very high rates