Which is why, when I'm perusing Ebay, I would never bid on any item where the seller's description was full of spelling errors. After all, if they can't be bothered to get that right, the item they're selling is bound to be grubby, smelly, fraudulently described and poorly packed.
I'm not put off by any misspellings in greengrocers as that is a traditional practice. But you'll not sell me any 'sausidges' or 'sirlions' in the butchers because I'll know your meat is fly-blown and badly hung.
However if you're a blogger and you leave a comment on my blog that contains a wee typo you will be totally forgiven. Because everybody knows that typos happen when your fingers are racing over the keyboard to put that pithy comment down before it escapes you.
In the restaurant if there's a bit of a blooper on the board advertising Dish of the Day I'll forgive that because the chalker's English is going to be way better than my command of Polish or Lithuanian. And the service will totally make up for it. But I'll not stand for spelling mistakes in the tea shop. Appel Tart? I don't think so!