Project administrative fees are commonly charged in addition to the investment and are not part of it. Government charges for the petitions appear in the USCIS fee schedule. Independent legal and accounting work on the source of funds is the remaining significant cost and the one most often omitted from a plan.
The investment is one number; the exercise is another
Hypothetical example: Solveig has been quoted a qualifying investment figure and assumes it is the whole of what the exercise will cost. Read an offering with a pencil and separate the lines. The qualifying capital is what goes into the enterprise and stays at risk.
On top of it sit an administration or subscription fee charged by the project, which does not count toward the investment, and government charges for the immigrant petition and the later removal-of-conditions petition, which are published in Form G-1055 and should be read from the schedule rather than quoted from a summary. Then come the costs of Solveig's own advisers. Her independent immigration counsel is not the project's counsel, and the difference matters because the project's lawyers act for the project.
Accounting work to assemble a source-of-funds narrative across a buy-back and a matrimonial division is real professional time. Certified translation of French documents is required rather than optional. Finally, the capital should never be budgeted as though it were recoverable, because the possibility of losing it is part of the structure rather than an unlikely accident.