Quite alright but
In a time in wchich people don't even pay for downloading music and movies, who is going to pay for an add-on. There is one costing nearly 300 bucks! It might cost more than your PowerPoint license. I am not advocating piracy here but there are plenty of nice free or almost free tools available. I cannot see how some want to charge so much for an add-on, not even a full software suite.
Keep Up with TechRepublic