1. Don’t bother with market research, because you just know lots of people are itching to buy your new product.
2. Only release the product once it is perfect. However long that takes.
3. Go into a market with very strong competition and compete with them head-on, because you only need a measly 1% of this market to get rich.
4. Go into a market with no competition. How hard can creating a new market and educating all the potential customers be?
5. Only think about marketing once the code is nearly complete.
6. Write software for people who can’t or won’t buy software (e.g. 10 year olds, prisoners, Linux fanatics, people in developing countries, developers).
7. Don’t worry about marketing, because good software sells itself.
8. Concentrate on the technology and impressing other developers.
9. Don’t listen to what your customers say, because you know best.
10. Don’t worry about usability. It took you thousands of hours to write the software. Surely the customer can spend an hour or two learning to use it.
11. Embrace bleeding-edge technology.
12. Don’t worry about backups, because modern harddisks are very reliable.
13. Don’t even try. Just give your software away for free.

Did I miss any?