The success of a research-active professor is related to his successful proposals for securing research funds. For this purpose, he should spend something like half of his time for writing proposals, but still he misses several possible calls for proposals due to the lack of time while the current proposals are not idea.
To resolve this problem, many people have this idea to hire a grant writer to perfectly and quickly write/re-write proposals. I personally heard this from many junior and senior professors, but in practice I have not seen any example.
This plan seems reasonable (the salary of a grant writer should be less than a postdoc), but why it is not common?
Researchers pay much more money to patent attorneys to have legally ideal text, then, why not investing on the text of proposals, which can directly enhance the chance of winning?