I think that is true fora lot of people. As an Idea, I agree with you 100%. I don't believe many people are willing to purchase Camtasia at a cost increase of 600%. Just to add notes, callouts, etc. SnagIt only records video at 10fps or less.
If you want a High Quality screen recorder. Stepping up to Camtasia makes more sense. You could create a note in the Snagit Editor and place it on screen as you record. I would, 1. Pause the recording 2. Open the note on-screen with Windows media player or some other player. 3. Recored it. 4. Pause and remove the note. 5. Resume recording.