I love magic because of the strategy involved in making those cheap decks

I have had a few infinate lifegain/ inf power decks i have made with almost all inexpensive cards.
I assume you mean it did cheap things like inf life gain.
But the deck itself was also very cheap

Personally, I would much rather have fun playing the game itself than making my deck. Once you build a deck that you're happy with, you move on to build another deck until you run out of cards to make decks with, at which point you buy more cards. It's an endless cycle, and for me, it got boring. Fast.
Plus, the game always ended up being 2 or 3 hours of the same thing over and over and over when I played with my friends. That's the point where I stopped playing Magic and started playing Pokemon and .Hack. Now THOSE are some rockin' card games.