No. Substantiality is measured against the actual cost of purchasing or creating the enterprise.
Budget the actual business
There is no dollar threshold, and treating any figure as one produces the wrong budget. Substantiality is proportional: the committed amount is weighed against the total cost of buying this going concern, or of creating an equivalent business from nothing, so a small enterprise paid for in full can satisfy the test while a much larger sum representing a fraction of a costly acquisition may not. Build the number from the transaction itself - purchase price, inventory and equipment, deposit and lease costs, licensing, fit-out, insurance, and enough working capital to carry the business through its first slow months rather than only to the day of closing.
Keep that total apart from two other columns. Government charges belong in a line of their own and should be read from current official fee sources on the day they are paid. Household costs, meaning the move, housing and schooling, belong in a third column and form no part of the investment.
What no column can do is substitute for the conditions themselves: treaty nationality for the investor and for at least half the enterprise's ownership, lawful source, irrevocable commitment, real risk of loss, an operating business that is more than marginal, and an investor genuinely directing it — in a temporary status that carries an intent to depart and opens no direct path to permanent residence.