Advertising and marketing expenses for the last quarter almost...

Advertising and marketing expenses for the last quarter almost doubled from $563,133 average over the three previous quarter to $1,081,690, accounting for the biggest share of the increase in expenses. I would think a lot of the results of this advertising would appear in increased sales in subsequent quarters. It would be rather pointless having a very useful app and then not promoting it.
Haven't yet seen a start up growing this rapidly being cash positive. Seems a very useful app from what I can see.