The requirements of multiple snakes is very easy even for the average person to meet. Heat and food once a week, it relatively cheap to keep multiple snakes. They take up a small foot print in the room and require no extra activities. They don't require interaction either besides cleaning and feeding. It's about as low maintenance as it gets for a pet.
My dog takes up more time than 30 snakes I have... a lot more time. When she was a puppy and getting all her shots, she cost a lot more money also. Shes all over the house, and requires a backyard, take her for walks, brush her, hair is all over the house, feed her 3 times a day ect. The requirements of a dog are so much greater than a snake or even 30 snakes.