I think you need to look at your technique on hitting your cymbals. I play hard as well but I have never experienced what you are talking about. I mean cymbals will crack over time but not that quick. You should have a sweeping motion across the cymbal not straight on up and down motion, if that makes sense? I hit my cymbals hard but since I have a slight sweeping motion across the cymbal when I hit it the force is not applied directly on the cymbal and it does not force the cymbal down and put as much strain on it which is usually why it will crack. You shouldn't be cracking any "rock" model crashes within a month or two. Also another thing to look at is how do you hold your sticks? Loose grip or stiff. If you are not allowing your sticks to rebound you are putting more strain on the surface you are hitting as well. Do you notice that you dent your drum heads a lot?
Tama Rockstar Custom, Zildjian A Customs and A series cymbals, Paiste, Sabian, Wuhan, Promark Japanese Oak, Remo and Evans Heads, DW hardware, Pearl Icon Rack, DW 8002 pedals