Don't watch many hosts. Have given this advice to many folks over the years in different types of situations: not everyone has perfect hearing. If you speak fast, they may miss what you are saying and substitute what they think you said. Some will just give up totally and pretend, nodding their heads.
If you are in sales, whether or not on TV, please slow down and pronounce all the syllables. If you rush, you may lose both the sale and your audience.
One last item: DON'T COVER YOUR MOUTH because some folks lip read. Either way, you are muffling your voice so those with good hearing are spending more energy trying to understand you.
We make a living by what we get. We make a life by what we give.
Sir Winston Churchill