Each of us is free to do what he wants with his money. I advise my clients to write or consult a neutral company for the drafting of the business plan. In fact, using a purchased business plan is like using a medical prescription for another patient. The business plan is a report that explains your project to your interlocutors whoever they are (bankers, platforms of crowdfunding, business angels, your family member, associates, etc.).
Read more: Should you write your business plan yourself or buy it on the internet?