Have Only One Product

No, you can sell as many products as you want using just Paypal buy buttons. That said, a good e-commerce script can provide a lot of useful functionality that you otherwise would not have... but it's definitely not necessary just to make a sale.

If you're just selling one product I would suggest setting up a simple WordPress website and using PayPal. That's all you really need for just one product.

You don't need an eCommerce script at all. You can just set-up a Wordpress blog with a nice theme and put a PayPal button on it with the product.

Why this obsession (of many) for setting up a "simple site with WordPress"?

For selling one little product you don't need any WordPress... what a stoopid idea :rolleyes:

You need a sales page and a download page + a PP account.

I can make a WP site even in my sleep but for a single product I wouldn't bother even thinking about it. What is way MORE important than WP when making a simple site for selling an infoproduct would be to have a solution for securing your download page - i.e. to make sure it is protected from being found/accessible without going through the payment process.

There are free products and cheap ones (like $7) and more expensive ones with many features.

That is the important thing, not WP. People who are web illiterate think that WP is an answer and panacea for everything - because they don't know better.

Remember: the most important thing about using 'scripts' is the protect your download page, so only buyers can download the product.