On paper, you're getting one and a half characters outright (160,000 coins from just the prologues) for a few hours of work. That's...not bad, since said characters would be sold as paid DLC anyway. But Capcom is counting on you spending your currency on outfits, leaving you with less and less cash to buy characters with. It's a common strategy that's used in a lot of games -- hell, the free market in general. If you can resist the temptation, you'll likely come out on top.
Assuming the well of solo coins dries up, beyond that, you'll need to win roughly 2000 games a month to get a free character. But there are concessions. Leveling up a character by playing them will net you an extra 1000 coins per level, for example. When the shop opens in March, more prices emerge, and other modes arrive, we'll update accordingly. For now, the high rewards for single-player content are great, but we'll see how easy it is to earn Coins once players cap their levels out. "More ways to earn coins will be added throughout the year" Capcom says, but for now, this is just a promise.
