EXP Crystals are usually worth the least amount of money depending on %, most people don't use them.
Token Crystals are usually set in the middle of the economy, token picks are efficient but not the best way to get money unless you've been playing for a really long time.
Sell Crystals are worth the most. You can get a lot of money & tokens with sell crystals due to the pickaxe level.
Long story short, your 90% token crystal is probably worth roughly 1t-3t or 1.5b-5b tokens. This number varies for several other people. I personally wouldn't buy this because sell boosts are better in my opinion.
Hope this helped!
