SBA Grant Question

[Michelle Eastland]

Hello Everyone my name is Michelle Eastland and I am new to bigger pockets. I recently started a Real Estate Investing Business and I am currently building my funding. I came across someone that is a professional grant writer and I wanted to know if it is common for grant writers to charge a fee upfront and an additional percentage of the grant you win? If anyone is knowledgeable in this area it would mean a lot to hear someone else's  point of view outside of the research that I have already done.