What do you think of this strategy?

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I am reading an ebook and it presents the following strategy:

1. Find out which homes in your area have tax liens on them.

2. Write the owners, tell them if they are planning not to redeem, you will give them $100 (or other small amount) for a quit claim deed giving you the property.

3. You record the deed.

4. You sell the property.

Sounds simple, but does something like this actually work? Has anyone done it? The author claims to have used this strategy many years to acquire a ton of properties, but I am skeptical. Any thoughts would be appreciated.