But, seriously, the intonation is different. If the verb is not stressed, then there should be some important information to follow, which might change its meaning, like an adverb or a negation. But that's not only in German, stress indicates the key word of the sentence in many languages. Also in many languages the word order doesn't change in interrogative sentences, so you have to wait until the end to find out whether the intonation is rising or not. So it's much more common than one might think.