The most efficient method of FIFA 23 Coins earning money from the cards is to purchase them during neutral periods to hold them for a while, and then sell them in the hype. For example, Liverpool's Darwin Nunez has had a slow start to his life on Merseyside with two goals from the league during his seven initial matches.
After an unsatisfactory 3-3 draw against Brighton and with more difficult fixtures ahead His OTW cost - just three days after the release date - has been hovering around 70k. A savvy investor could decide at this low moment to buy one, and then decide to sell it before the next Liverpool match kicks off, particularly if Nunez is in the line-up. A more reckless investor might decide to keep it until the game, hoping Nunez scores, but the risks are much higher.
One thing to look for when using OTW cards is when upgrades are already "priced in'. Everybody knows that Man City is going to win 3/8 games to get Haaland the first OTW upgrade, as an example which is a large part of the reason behind his high in-game cost. Don't be fooled into buying players who will obviously get three wins with the hope that prices will increase in value when the time comes around. It is likely that this will result in a large number of players trying to cash in simultaneously, making the cost go down.
Ultimately, Ones to Watch cards are predictable in specific ways but unpredictable in other ways. It's the unpredictability that is fascinating about them, however understanding the predictable peaks and lows - investing when they're low, and selling when they're up - is the only way to create coins from them reliably.
Like Jose Mourinho parking a bus, Watford sacking another manager, and Jurgen Klopp moaning over fixture congestion The football season would not be the cheapest FUT 23 Coins complete without a new edition of FIFA.