Just yesterday I was reviewing my homemade spam filter. I do that sometimes to find out what new trends are showing.
There was one that got caught with a weird subject : out of 6 words, five were misspelled.
The spammers seem to have read the memo that says that, as long as the first and last letter are the same, the letters in the middle of a word will actually be more or less correctly interpreted by the brain.
To me, I cannot for the life of me imagine why anyone would want to open a mail entitled "mkae yuor wfie more hpapy" and hope to find legitimate information inside.
If anyone writes me a mail with that kind of spelling, I'm sorry but I won't even try to decipher the subject - it's direct to vertical storage.

Thankfully the delivery method appears to rely on the good old "get some idiot to open a suspicious email". By now I hope most people have gotten a little wiser in such cases, though I guess for every person that learns, another person takes their place.