seriously, if you're 14 and pulling in 5K a month, why do you want to grow? I'd be hard pressed to spend 5 grand a month if I didn't have a mortgage, car payments, insurances, etc. etc. and I'm only 20. enjoy it while you can, man, you'll have way too many bills sooner than later.

keep your high-paying job for a couple years, buy your weed like you normally do, and go get yourself a kickass condo and a nice car when you hit 18.
you're making more than enough money for your own good to ruin it by getting sent to juvie for marijuana cultivation.