Perhaps you can help answer that since apparently you have trouble with "wikianswers". It seems to be a combination of things.
- People who don't know the proper spelling and don't bother to check.
- Non-native speakers who have more difficulty with recognizing incorrectly spelled words or getting a spelling close enough to look check.
- English is a notoriously difficult language to spell. It has borrowed words and roots from many different languages, so the rules are complex, and there are many exceptions.
- People who make typing mistakes and don't proof-read well enough.
People can't even be bothered to ask whole question. Why would they care about spelling?