Short time frames and code quality being less visible to customers than construction or build quality of physical goods. It's a lot easier to build a (really shitty underneath the hood) app without experience than to design or build an airplane without experience. In most cases you can dump a good chunk of your stake for a massive profit before the poor infrastructure and maintenance costs become an issue (the Twitter "fail whale" and rewrites are the outlier here, I think, where the scale came much faster than the payoffs).

Maturity. Not every industry can sustain a "move fast and break things" mentality. Software is fairly young in terms of capital investment growth. Wait till it becomes as boring and grave as manufacturing.