A rule of thumb is that $1 in sales/marketing expense should get you at least $1 in additional gross profit over the next 12 months. Depending on how much of th

A rule of thumb is that $1 in sales/marketing expense should get you at least $1 in additional gross profit over the next 12 months. Depending on how much of that $47M was new revenue, it sounds like they're in decent shape on that score.