Well, the slot machine and the electrums give the game a bit of a ''gambling'' theme. What you win is not XP by the way, just ''gold.'' The amount of electrums does not help you in the game, only buying a 'weapon'' (card) does. Did you ever play any games in which even using a weapon cost you your gold, while you use the same gold to buy weapons?
I know it takes long, I was ready to quit myself... But in the end it is still fun to just play and try, after you'ven taken a break of a week.
You should not be losing half of the time. A fast deck can win in 2 minutes also. Even if you lose a few, 10 wins should not take you over 26 minutes. The cards won make up for any losses... If you are ready to face t50 and win just half, a rare can still be worth 100 electrums. So a quick t50 session goes a long way to those 1500 electrums. The beginning is hard... but once you upped 10 or 15 cards it gets easier. Just use the fire rush/life rush/graboid rush with shriekers/defence cards and start to upgrade it. You can also use a FG slayer deck off the forums right away, though I bought one and it is very slow.