The philosophy is modelled incorrectly. Rather than being paying customers of a software costing $15 and expect support forever, be a paying customer of softwa

The philosophy is modelled incorrectly. Rather than being paying customers of a software costing $15 and expect support forever, be a paying customer of software costing $5 a month and expect support every month, while you're paying. With regards to perpetuity software, the developer only has incentive to keep on building the product whilst the market is relatively unsaturated. When the entire market has purchased the product, the developer is no longer incentivized to produce new features besides the ones he must build to fulfil his contract (e.g. fixing bugs). With a monthly subscription model, the developer must continue to improve the product, lest his customers switch to alternatives.