1. A cheap next generation turbofan 800lb class, costs around $125,000 US.
2. Jet engines must be all of the following
c. Easy to work on (relatively)
d. Able to withstand high tempratures
e. Meet stringent Certification standards
3.To accomplish this jet engines are
a.Hand built for the most part
b.Made of leading edge superalloys
c.Often times some components are "grown"
d.Thousands of personhours are used in development
If you consider the rigorous tests these engines must be put through and not only not fail but still be usable you are getting a bargan!!!
Let's make a comparison:
Let's take the average automobile, let's say you, over the life of your auto you average 30 mph (that's about the life average of a car, you spend time idling in the mornings to get the interior warm, stoplights, etc) that means you will cover approximately one half mile per minute. That means your engine would be designed to last 120,000, the auto industry designs engines to last 36,000 miles. This engine would have to prove that it could run this time (assuming scheduled maintenance) without a failure, could absorb thousands of gallons of water per minute without failure (your auto cannot handle more that 1-2 ounces) accept and still run while ingesting birds and other foreign objects, (don't even think of this with an auto) and still not fail.
Jet engines are expensive, but they are quality devices.
If anyone wants my source data on this:
Using Agilis TF-800 Specs, design life 4,000 hrs, 2,000hrs TBO (min)
Using Ford V-8 Chilton SM 8793