Yes, I purchased a lot of parts to increase my rank. A few months ago, my rank was around 1000. So, I purchased a significant amount of parts to increase my stats faster. My focus is to reach above 500. Right now, I am investing my earnings back into the game to improve my stats and rank. I claim at 12hr claim cooldown. this gives extra boost to the claim. So reward claim is much better. More stronger means more reward. Hence focusing to upgrade my stats faster.