I guess if you're unemployed or in an area with spectacularly low wages, and don't have any ideas of your own that seem monetizable.
>Most people will continue spending $1.00/month here, and $2.99/month there.
If I make 100 dollars an hour as a consultant, and I spend 1 hour to make a local version that never needs any updating on my part to replicate a portion of that functionality I get for $1.00/month, it will take me 101 months to see any profit on my investment of time.
Cut my pay in half and I still need 51 months to see any profit. It would be idiotic for me to waste 1 hour on that.
And let's face it, code when made is a cost center, you will have to keep it up to date (so as to not introduce security hazards etc.) you will never break even much less earn anything for your time.