Google Play's Top Paid and Top Grossing App lists look quite different. Not only are there different inhabitants (Electronic Arts, for instance, has four of the top ten Paid Apps but none of the top ten grossing apps) - the business models and interactive models are obviously different.
Here are screenshots of each list - Top Grossing is fascinating and shows that two gaming companies (Supercell and King) dominate that list:
Top 8 Grossing Apps:
Supercell: #1. Clash of Clans #5. Hay Day #16. Boom Beach