Here's my final word on this. As far as your friend playing with the animals, some can take it, some cannot. My daughters play with many of mine like they are barbie dolls and they are fine. I have a couple they are not allowed to touch for various reasons.
The only cure for your friend may be to ask what pet store owner is willing to give wholesale for a particular animal. Odds are he will be shocked. It is waaaaayyyy less than the ticket price.
Also calculate the hours, food and other expenses it takes to take care of each animal. I can tell you this to the penny. Then..... there is always the possibility of a sudden vet bill which could take a significant bite into your yearly expenses.