I believe you need to think long game. Snakes live for a very long time. So - even though having the third may be manageable now, will you still have the time when you've got kids (assuming you don't), or you get a Dog, or some other pet down the line. I have experienced 1 snake, hundreds of snakes and now I have 2. I like having 2 snakes, 1 Boa and one Ball Python. they're different, each with their own personalities and traits - but to get another Ball Python or another Boa for me seems like a waste of opportunity. Why not, if you're going to get a third snake, get something different. Why not get a Hognose?