1. Not an issue for me, everything I own (in sig) comes with me.
2. 4 (1 is plastic spare ball)
3. Last year I just had my Ruckus and Thug. The Thug obviously would hook way more and would require me to stand 4-6 boards left of where I would play with the Ruckus. I would use practice time to determine which ball to start the actual game with. Also watching how others are playing the lane would determine if I should use the Ruckus and play right of most, or if the others are playing a line that is close I would go Thug and play a line at would allow me to keep moving left to stay in the oil a little.
4. typically i make the change when one ball starts over hooking I would switch. I've got my ruckus pin up, so it reads the lane earlier, the thug is pin down and can read the lane farther down.
5. When I buy a new ball, it's either to replace a ball that doesn't work anymore or fit my game anymore. I bought my thug corrupt to replace my thug, however I had it drilled a little different so I would be more useful in heavy oil conditions. So basically I buy a ball that I feel meets my needs and fills a gap that I currently can't support in my arsenal.
Bookmarks