Not necessarily. Substantiality is proportionate to the cost of the particular enterprise, and a cheaper business can make marginality harder to overcome rather than easier.
Cheap can cut the other way
Hypothetical example: Because there is no fixed minimum, a smaller purchase is not automatically a weaker case on substantiality — a modest amount can be substantial relative to a modest business. The difficulty appears at the other requirement. An enterprise bought cheaply because it earns little has to answer the marginality question: can it generate more than a minimal living for the investor and family, now or within a reasonable time, or will it make a significant economic contribution.
A Selwyn investor choosing between a lower-priced seasonal operation and a costlier year-round one is therefore not simply choosing a budget. Each has a different evidentiary burden, and the numbers that make one affordable can be the numbers that make it harder to defend. Fees payable to the government are separate again and are set out in the applicable official schedules.