On the one hand, Pentatonix absolutely deserved the #1. It'd be a shame for them to lose the top spot even though 10k more people paid money to purchase their work.
On the other hand, Demi's numbers are pretty good given that she didn't have a smash hit. 78k in this day and age (and almost 100k with SPS) is nothing to frown upon.
Good for both of them I guess