If you're going to sell a small number of units you'll need to sell them at a high price. So you need to ask if people will be willing to pay a high price for w

If you're going to sell a small number of units you'll need to sell them at a high price. So you need to ask if people will be willing to pay a high price for what you're building. If you're software is something that saves the user millions of pounds, for example by helping petroleum companies optimize their mining or reducing medical diagnostics cost then selling it at a high price is perfectly viable.