Buying typo domains is good if: 1. You have a lot of money. 2. You might be a phishing target. 3. There's an affiliate program on the non-typo domain. It's

Buying typo domains is good if: 1. You have a lot of money. 2. You might be a phishing target. 3. There's an affiliate program on the non-typo domain. It's a good idea to try to buy the most popular typos, you can get an idea if you check the search query frequency for each typo (try the Adwords Keywords tool) or you can "kite" a bunch of typo domains and delete non-performing ones before you have to pay for them.