Well, this is done because properly spelled words of this kind would have been identified as spam by automated spam filters. Mispellings go through and people can understand them. Pure business, not illiteracy or stupidity
I also know professional copywriters, that make $25,000+ per sales letter, who use occasionally use misspelling as a marketing tactic. For certain products, people who get hung up on a spelling error in the middle of a sales letter otherwise spelling out clear benefits are know as "hassles." By eliminating those people from your sales, you can end up much happier in business working with people that are more to your liking.
Or to quote Robert Kiyosaki, author of Rich Dad, Poor Dad: "I'm not the best author. I'm just a best-selling author."
Anybody claiming that The Avengers is the best film they've ever seen obviously has not seen many films, or has an extremely short memory. I'm pretty sure these people were the same ones who were saying that Avatar was...