I finished in Silver I last season which is about as good as it gets for now. I'm at roughly 70,000 DEC conversion value for my cards and till the Chaos Legion packs go on sale, I won't be adding to my DEC power in a meaningful way.
Rewards were not the best. The Epic Lava Launcher is very welcome as are the couple of Rare cards.
Total DEC earnings for the season was 2,831 DEC driven mainly by the ranked battle rewards which accounted for 2,000 DEC. Rentals also added 500 DEC over the season.
At current market prices, that's about $40 earned over the season, not including the card rewards. Not too bad considering I only play for about 10 or so wins a day. Some days even less.