Rudy,
$4 a week X 52 weeks per year = $208.00 per year. If you stick to 1/72 scale kits, you may get away with decent number of kits. When I was growing up, my allowance was about the same and I saved up for a month and bought 2 Esci 1/72 armored kits and rest for painting supplies. Gosh I miss those days. Another suggestion that I have is that you really need to find yourself a sugar momma to support your addiction [:D]