Casablanca Tires... when you want your tires gently used!

The wind is blowing the corner of this sign, partially covering a glaring grammatical error.  Unfortunately the strange looks I was getting for taking this photo did not allow me to stick around and wait for the wind to stop.  What it says is, "Yes, We do sell new tires for less!!!"
I am confused as to why they thought the 'We' needed to be capitalized.  It should read, "Yes, we do sell new tires for less!!!" 'We' should only have been capitalized if it was starting a new sentence.