Or, to reframe the question for the startup crowd, what is the average wage that a typical high-tech entrepreneur makes, considering hours invested/sale price of the business?
Some people go negative. However, the average is so heavily influenced by a few people making 100+$/h or 10,000+$/h. It's not really worth looking at. I would suggest consider looking for the bottom 10 percentile the middle 50 percentile and the top 10 percentile.