Interesting. That's funny, I was putting mine into a spreadsheet as well. So is this watching prices on cards you are holding and you are adjusting as time goes on?
I was recording the FMV as I was collecting them and I was recording about a 30-40% haircut at the time of purchase. Sold lots because I wanted some percentage of them converted to STEEM. Kept lots too. My sample size is about 2k packs. It is as you say luck of the draw, but I keep saying how its the only way I know of that you can buy NFTs using paypal that are directly convertible to STEEM. Perhaps things are accelerating and I should give it another shot.
These numbers are based on current asking prices. So you might apply a discount between asking and liquidation prices and arrive at a different profit amount.
I wish I had kept better records for my own investments into cards. But I didn't, so I don't have that information handy.
Ah cool. Going to make a post here shortly. I just opened a group of packs that have probably wiped out my previous losses or at least got me pretty close to even.
Awesome!