Just got screwed (nearly screwed) by a Steem Monster deck owner that agreed to sell his deck and then changed his mind as I am about to press SEND on the payment.
So, be sure you trust an account owner before you send Steem/SBD.
If you have another more known account you both trust, then have them hold your funds until the deck has been transfered.
Because ultimately people are stupid. Either out of ignorance or from being weak minded. Sorry, but if you TWICE say OK to an offer and agree to sell, it is just LOW to change your mind and backout.
It wastes peoples time. Maybe causes them to pass over another deal they could have made. All around bad character. My time and opportunity was screwed, I hope it never happens to you.
Okay, I've vented!!! Moving on now.
If you want to know who, I have commented in the Traders Talk chat room on Steem Monsters Discord. I commented less than an hour ago. Should be easy to find.
Peace