The official page describes a nonrefundable processing fee and a gift to the U.S. government; neither is an investment and neither is returned. Government fees for the resulting immigrant process are listed in the USCIS and State Department schedules. Verify all amounts on the official source before paying.
Assume nothing comes back
The cost structure is unlike EB-5, and the difference should be stated plainly. In EB-5, capital is invested at risk in an enterprise, and any repayment depends on the offering terms and project performance; the contributed cash does not remain the investor's property. Under the Gold Card framework, the gift is a gift: it transfers to the U.S.
government and creates no ownership or claim. The processing fee is described as nonrefundable, which means an applicant refused on vetting or inadmissibility grounds does not recover it. Beyond those two amounts, budget for the government fees of the underlying immigrant process for each family member, legal review before paying anything, and civil documents and translations.
Hypothetical example: a Lac-Beauport dentist selling a practice compares the after-tax proceeds against the gift plus fees and finds that, unlike an EB-5 allocation, the whole amount is spent rather than deployed. That is a different financial decision and should be made with a tax adviser who understands both Canadian departure tax and the U.S. treatment of the payment.