That's a good question. I guess the answer depends on if you can find enough underserved niche markets that you know enough about to create something unique and special.

And remember, that $10k was in 6 months. So potentially, we're talking about $20k/yr for this app. 10 apps would be a potential $200k a year.

Right now, I'm content with this being supplementary income, but I never imagined that when I paid that $99 developer fee that I'd do so well.

Congratulations on your success. Shows the market is ripe for attacking niche markets. But you also did some smart marketing as well.

The answer just has to be "yes", subject to the number of party-based network marketing type operations, especially those for "soft-goods" such as semi-precious jewelry, soaps/toiletries, candles/ornaments, lingerie/(err)novelties, etc.

Hostessing these sort of deals successfully takes a lot of prep and work up-front, during and after to make sure it runs smoothly, customers are totaled up correctly, orders placed, items delivered etc.

There's likely a wider scope for checklist and CRM-type apps...

I know i'm a bit late on this, but here's a PRIME example of someone using the shotgun effect in the itunes store: http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewArtist... 504 apps all with slightly different title and keywords, all with sub-par execution (based on looking @ screenshots)

I think their company name says it all: "FQ Publishing"

Yes or from fewer, if you can find a good niche:

http://blog.lescapadou.com/2011/10/how-ive-made-200000-in-io...