If customer acquisition cost is low enough to make your one time pricing make sense, then by all means, go for it. I would guess that it would only make sense

If customer acquisition cost is low enough to make your one time pricing make sense, then by all means, go for it. I would guess that it would only make sense for software so cheap that recurring billing didn't make sense. ($10-20 total lifetime value of a customer). The trouble is that getting customers that cheaply is difficult, and even harder to scale. Upselling existing customers with recurring revenue can be much easier than getting new customers.