When posting, please remember that you are wanting to create a business relationship - whether a contract or work relationship. Use your post to present a professional image of yourself & if relevant, your organisation. In addition to what you are looking for, provide your name, title, and contact details.
I came across a very interesting blog by Alan Matthews in which he discusses the five reasons as being:
1. They want to overdeliver
2. They feel anxious when they're not "doing something"
3. They're too attached to their content
4. They don't know enough about their learners
5. They think that the amount they cover equals the amount people take in
Some very interesting points to ponder... See https://www.linkedin.com/pulse/5-reasons-why-trainers-include-too-much-content-alan-matthews for the full blog.