The answer is because most non-technical co-founders don't bring much to the table. Many don't have startup experience, management experience, fundraising/angel/VC connections.
If you want to tech co-founders to work with you, you need to demonstrate something.
You're extrapolating results from 3 months into years? Uh... yeah...
It doesn't sound that easy or stable if you are willing to sell it for 6 months profit instead of using your 5 minutes each year to run it forever and making $900/year.
This is both true and false. While corruption is rampant and often expected, the environment can be easier particularly for lower capital businesses.
If you want to open a restaurant here in DC, it will take you quite a long time to get all the permits, permissions and inspections done. If you have to remedy anything, it probably won't be cheap. Once you have all the permits, you have to apply for special exemptions to stay open later, to serve alcohol, etc.
When a Latino immigrant woman tried to sell her food on some neighborhood street in DC, she didn't even last a day. She tried (at least) twice, and she was promptly ticketed and got in some trouble for selling simple treats on the street.
In contrast, in the developing countries the business comes first. You worry about making money. If it's actually working, then you can start worrying about bribes and taxes and regulations. So it can be cheaper and quicker to startup as many of these expenses are on the back end instead of being front loaded.
It's not the government and it's not the business environment. The problem is with the people.
Look at some of the "worst" African countries. Chinese and Indians are coming in there and opening up shops. They are starting restaurants and barber shops and all kinds of low startup cost businesses. They are doing well, and they are putting the old school 'local' businesses out of business. In fact, in some African countries they are considering making residency much more difficult for the Chinese because they are so successful there.
Too many people in African and Latin American countries have a sense of entitlement. When they think a community needs something, they think the government should provide it or subsidize it.
It is hard to shift this mindset, but it is happening in some urban pockets. There are small circles of entrepreneurship in most bigger African/LA cities. (I'm talking about guys starting from ground up, not rich privileged people starting more capital intensive enterprises.) But it's going to take a while.
Ironically, the biggest sense of entrepreneurial spirit I was was actually in Zimbabwe. As bad is it is there right now, I have a feeling this will be a big positive turnaround sooner or later.
My initial feeling is that the most crud left behind is from professional fakers, aka menial labor from India/Phils/etc. That's where one can buy fake reviews en masse.
That explains point 1, 2, 3, 5 and possibly even point 4. (working time difference, and cheap equipment.)
The key to detecting fake accounts is tractability. That's why FB logins are gold. You can look at the account and - most of the time - it is easy to tell if it's real or fake.
The problem is that many sites want volume, not quality. They just let anyone "add content". This is a an easily solvable problem that most sites do not actually care to solve.
Is it really that hard for you to tell a fake FB/twitter account from a real one that you couldn't code the logic?
You don't even have to code it. You just need to link it. If someone is reading the review, they can go back to the person that wrote it and judge for themselves.
Sadly, I think you may be right. We can do better though, because it still sucks. Something merging the innovations in thread sorting from HN and cherry picking from large amounts of comments from /. would be nice.
If you want to tech co-founders to work with you, you need to demonstrate something.