On PS3 last year, the market was really high for the first few months, and then crashed huge.
I'm not sure if next gen or 360 were the same. But high 80's centres like Couture, MacKinnon, maybe Spezza were going in the 30k-40k range, and ended up dropping quickly to being worth almost nothing. So if you pull some of these mid range guys and you don't use them as much, it might be a good idea just to sell them now and wait for the market to come down.
It seemed like really elite cards held their value a lot better throughout the lifetime of the game.
You need coins to make coins. I'm not on next gen, so I don't know how much different the game is than 15 was on PS3. But the best way to initially make coins is to choose a consumable, figure out what their baseline price is, and then stock up on ones that people list too low. You make like 500 coins a card, but if you check before/after every game you play, you might find 1-2 cards each time, and it adds up.
Once you have 10s of thousands of coins, focus on a few different players and get to know their values. Player values go up and down during the week depending on what packs EA releases. I found player values usually peaked mid week, and plummeted on weekends.
For example, on PS3, near the end of the game I knew a card like Ray Bourque would sell for 85k-95k easily during the week, and on some weeks could sell for as high as 100k-110k if there weren't any others on the market.
On weekends when the mega packs came out, Bourque would plummet to as low as 60k buy it now, and there'd be a lot listed in the 70k range. So I'd buy at that price, re-list at 3 days, and end up making 10k-30k pucks off of a minute of work. Multiply this by however many cards I could afford to flip, and I'd easily make 100k pucks a week to finance what ever special cards I wanted to buy that came out without wasting a lot of time or spending real money.
Another tip, when trying to buy a card, look at how many owners a card has had. Basically psychology. If a guy has bought a Shea Weber card for 300k to complete a collection, anything lower than 300k, he is not going to want to take as he'd be taking a loss. If a guy pulled a Shea Weber from a pack he bought for 30k coins or 5 bucks, and you offer him 200k-250k when the card sells for an average of 300k, if he is impatient he'll be very likely to take that 200k-250k because to him it is found money. He only spent 30k to get that 200k and wants to buy more packs.
If you see a card with 2 or more owners, it is more than likely someone flipping him, or someone doing collections, and they'll have a relative idea of what they spent on it so they aren't going to accept an offer below market value.
But can't.
