Not that quickly!

I am buying up a few low mana cards now and then, they're the ones that seem to hold their value. 

I'm being very disciplined not to invest more than a couple of hundred Steem per PD... the market, unsurprisingly, is largely controlled by a very few people. 

Although I have come across a couple of people willing to spend hundreds of dollars on one card. (I'm not one of them, although I did just max out the Dragon Jumper, STUN is one of those abilities that does very well.) 

NewAgeInv who you might now recently bought a Prince Julian. 

Look up how much that's 'worth' if you want a laugh. 

Problem when you only have a few maxed legendaries is you want to play them all the time, and not necessarily when the rule set suits them. Then you eel pretty stoopid when you lose!