I actually cannot believe you just said that! How is steel crap and heavy, tell that to the leeson riders. They are light because they have doublebutted tubing, and thay are all short so thats 9cm off the length/weight of a vinco already. (1010- 1100wb).
And if you change frames every 2years why can you not sell it? Allow someone else to benifit from it, rather then just killing an alu frame. But I must admit those pitbulls and echos are bloody strong, doubt many people will kill them in 2years.