Thank you all for your replies. I tried to tell him the risks and tell him how it is a lot of work, but he will not listen to me. He is a very stubborn person - and always take the advice I give as if i'm talking down to him, despite what the realities might be. Even tho I just state the facts.
He is currently keeping his animals at his girlfriends brothers house who has a boa and actually knows how to care for snakes. I can only assume he is the one feeding/caring for the snakes, since it would require a cross city bus ride for my friend to do it himself.
When he wanted me to keep the boa (that he never bought because I couldnt keep it in my house right away), he offered to pay for its food and etc. Which hints that I was going to be feeding the animal, handling it, and cleaning its cage. Which in my opinion basically makes it mine.
I tried to talk to him about this stuff, he just says he appreciates the advice and then sluffs me off.
Whenever hes around these animals hes CONSTANTLY trying to take them out and play with them, that's why I don't think he understands that these are animals that deserve respect and NOT toys to constantly be played with. He hasn't had a "hobby" before this, so I think hes really just doing it as a "Status" thing, and because he excited about something new. It is like he is only interested in reptiles so he can be "that snake guy"
His plan is to sell the offspring to a local reptile store - which I highly doubt is even a good business plan. Which he doesn't have.
Thank you all for your understanding and comments. He is spending hundreds of dollars because he "cant pass up a deal". What should I do?