LOL! $5000 dogs and people who cannot spell.
I am a retired English teacher -

but I can't always spell and/or type. For those of you who have a real spelling problem let me clue you in. The ability to spell is linked to a gene. You either have it or you don't! Don't sweat it - just keep a dictionary handy for the important times.
However, I too believe if you are seriously trying to sell something, the ad should be correct gramatically and the spelling should be correct also. It just looks better and doesn't open your ad up to ridicule.
Just my 2 cents, now y'all go ahead and have fun and don't worry about spelling OR typing. We can all read it.
Jeanne