Longtime lurker, finally compelled to speak:
1. Eye tracking, IMO, requires real need and investment. The eyes are
very complex sensory organs, and where they are pointing, and for how
long, are not necessarily readily interpretable data. There's a lot of
debate in the research world on how to assess eye tracking data, and
there are questions that you need an expert to answer: What kind of
movements are you seeing? Are they saccades, intentional moves, or
tracking? Why? For how long?
Can you do eye tracking inexpensively? Sure.