The thinking goes; if you bring in a partner to start a business that has a skill you don't have your start-up time will be faster and your chance at success will be greater.
If you've both started businesses before and been successful, then this may be true. However, most people haven't so they don't have the experiance to make a business successful let alone a partnership.
The irony is partnerships are almost impossible to get to work. There are always squabbles over who does what, how much time is spent, how to divide the money. When to take money out of the business, when to spend more on advertising and probably the biggest, ..creative differences.
My suggestion, if you're starting a business and don't have a skill you need, for instance, web design, marketing, filing a patent, or video editing. Learn it yourself, it will likely be far easier than trying to partner with someone else, and at the end of the day you'll have a sought after skill and the full understanding of how to use it best in your business.
And oh ya, you also keep all the profits of the business!
