If it is not clear, I am not a home inspector. I have worked with many (some are my best friends!) and have a great deal of respect for their particular expertise.
I HAVE worked with infrared for 25 years and looked at thousands of buildings in that time. Much of my work has been related to energy analysis, insulation checks, problems solving, and air leakage studies. Sometimes I worked for the seller or a contractor but usually for the buyer or owner.
Typically I spend 1-3 hours in a home (of course size DOES matter in this case), less if the owner is not there and more if they are. 
In the past my infrared camera cost $20-40,000 and I knew pretty clearly what my monthly payment on it was as well as what my other costs were. I would typically charge $300-600 for a full analysis of the insulation and the air leakage (using a blower door). I’d also produce a full report of my findings.
Clearly this was a lot of money for some. I never pushed. If they saw value, we worked together. If not, they could figure it out on their own!
Nearly everyone I worked with ended up pleased because the findings made a difference to their comfort, reducing their fuel bill or solving a costly problem. I reminded them that the report had immense value for anyone who owned the home. Often when a house was sold, they completely recovered my fee by being able to command a higher price because they had PROOF of the actual condition of the home.
Obviously it you can’t sell value to someone who doesn’t recognize it, but selling infrared based on the real value provided is a pretty “easy” sell in my experience.
Again, my $.25 worth as a non-HI guy. I hope this post has value for you!
Thermally yours,
John Snell
ASNT NDT Thermal/Infrared Level III #48166
Snell Infrared
800-636-9820
802-229-9820
http://www.IRTalk.com
