The petition fees are published in the USCIS fee schedule, Form G-1055, and are only part of the outlay. The corporate evidence, the American staffing needed to support a managerial description, immigration counsel, and any response to a request for evidence usually cost more than the filing itself.
The expensive part is the evidence, not the form
A transfer petition is a documentary project. Someone has to reconstruct ownership across two jurisdictions, obtain certified corporate records, assemble payroll history, and write a position description that survives scrutiny, and that work is generally done by counsel and by an accountant rather than by the family. Premium processing is available where speed matters and carries its own fee, but it buys a faster answer rather than a better one.
Where a request for evidence arrives, the response is a second round of the same work. Hypothetical example: a hemp-fibre processing company budgets only the filing fee and premium processing, then discovers that proving both entities are doing business requires an accountant to prepare interim statements for a company that has never produced any, and the cost of that exercise exceeds every government charge in the file. A realistic budget therefore carries three lines rather than one: government fees, professional fees, and the accounting work needed to make the corporate picture provable.