Invetro Fertilization?

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I was watching Oprah and there were people on there who were going through the process of IVF. They talked about all of the shots and the pills they had to take, all of the money they had to spend and I got to thinking; why would they do this? I can understand for some super-rich person who wants their own child who can afford to spend upwards of $20,000 - $30,000 every few months, but what about those people who aren't in the "rich" category. Just the average person, what makes them decide to get IVF instead of adopting? While I realize that adoption can be quite expensive in some cases, in most cases it is less-expensive than IVF.