It can be really difficult to obtain money from financial institutions based on a business plan alone. The problem arises when you have someone with no commercial experience trying to make a decision on your plan.
One of the biggest factors the decision maker will look at is risk - risk that any money they invest will not be returned. When looking at risk the main factor the bank will be interested in is:
- Your experience in this business
- The amount of money you are investing vs how much you are asking for
The last point is particularly important - if you arrive at the bank asking for a large sum of money but you have no security / you haven't invested any money yourself than you are unlikely to succeed.
In short, no matter how good your plan is, the bank will want to know about what you as an individual will bring to the business.