Why choose a professional workroom pattern?
Professional patterns don't have the same copyright restrictions as 'home' patterns. A professional pattern is intended to be used over and over in a business to make a profit The 'home sewer' pattern companies restrict the pattern use to personal use, and the patterns can't be used in a business.
Also, professional patterns are made to different standards than home sewing patterns. Professional finishing techniques and extra fullness are included in professional patterns.
And lastly, a professional pattern saves money. Time is money. Why re-invent the wheel, when it will take a few hours to do so? If it takes more than one hour to make a pattern, then you've lost money. For the cost of approximately what you charge for one hour of your time, you can buy a pattern that might take you several hours to make on your own.