The investment itself dominates, and it is capital rather than a fee. Around it sit due diligence, valuation, legal and accounting costs, plus the government charges published by the Department of State.
Capital at risk, and the work that proves it
Treat the purchase price as capital committed to a business that can lose money, not as the price of a status. Above it, budget for the work that establishes the case: an independent review of the seller's financial records, a valuation or an allocation between assets and goodwill, U.S. counsel for the purchase agreement and escrow, accounting advice on the structure, and the effort of assembling a source-of-funds file reaching back several years. Government charges for the application are published by the Department of State and should be checked at the time of filing. Then budget the working capital the business genuinely needs for its first year, because an investment that leaves nothing to operate with tends to raise the very marginality question the file was meant to answer.
Hypothetical example: a guitar-repair workshop buyer has priced the business but not the refitting, insurance, inventory, visa charges, and runway before customer revenue. The first review should separate acquisition price, funds exposed to loss, government fees, advisers, working capital, and personal living costs. Invoices and signed commitments settle the enterprise cost; a household budget tests survivability. Price the operating runway before deciding the investment is substantial enough. The common error is using every dollar for closing and leaving no credible way to operate the real business the application describes.