My 2 cents:
If you want a bigger collection of snakes, start budgeting. Electricity, vet bills, back-ups and redundancy for equipment, cleaning supplies, feeders, etc.
Then, consider the time, effort, and money that would go into raising feeders. I like my rats, but they are time consuming, their caging and feed and cleaning supplies all cost money (I go through a LOT of paper towels, and am always scrounging for free newspaper), and they do smell, even though I clean and disinfect daily. The output isn't always even either. Even with breeding rats, I am waiting on a frozen Big Cheese order because some pregnancies I thought were assured, didn't happen on schedule.
Rats will take your hobby from casual to high maintenance with daily chores.