[matt_s]

I think this is the key thought process for purchasers of software/SaaS. For comparison, an average daily meal expense of $30/person for business travel exceeds the pricing of a lot of SaaS offerings. SaaS is so simple and the cost level doesn't require RFPs, lawyers and accountants. It would have to be really compelling and niche to warrant custom install software these days (to OP, many retail POS systems are old school textUI too).

In the pre-SaaS times, a software business would have to somehow guess/calculate the lifetime value of a customer and bake that into the price of the software when it was buy once. Custom software also was often charged in $/seat, required IT people to do updates and that style of software often requires sales people and convincing CxO's to do purchases. SaaS can just be a CC swipe and expense report.