This article is silly, and just wrong in every way. It totally discounts time spent doing these projects, and totally fails to understand expected value. For instance:
"I wrote a desktop software once, and priced it at $29.90. I sold one copy a month, which was terrible. That's $1 a day. It's really easy as a programmer to do something that makes $1 a day."
I suppose if that desktop software took an hour to make it would be worth it in a few months. More likely it took an amount of time that would better have been spent (from a purely financial perspective) working at Wal-Mart and then investing the funds in an ETF. To make $1 a day ($365/yr) takes only around $4k (what a good programmer earns in Also even if you assumed every project would net $1 per day, you'd still be better off thinking big. A hit Facebook app, for instance, might make $10,000 a day. (A megahit 10x that.) A good keyword to arbitrage via an affiliate account and AdSense could do the same.
You're far better off taking a 1% shot at $10k/day than a 100% shot at $1. (You're far better off taking a .1% shot.) You might say "well what about variance" but apparently you have the time to create 400 products.
Also, Twitter followers have done little of real value for anyone in terms of making a business profitable. On the list of ways to get customers to your web-based business, Twitter's still pretty far down the chain.
A far better plan would be to try to create one product that makes $1 per person you drive to it. This is doable. Then you can buy users for far less with ads, roll your profits into more ads, rinse, repeat. This is how people like me who rarely if ever use Twitter have made oodles from the web. (I've done this now multiple times, for reference.)