It is supply and demand. It is also psychological to demand more money for more thrust.

Now to be fair, think about this:

cost of parts to make any turbine $500-800, now add INSURANCE, R&D, rent, phone bill, staff salary, advertisment, trips to shows, repair equipment, test equipment, LOW volume (in hundreds only per year), discounts to dealers and reps and and SOME PROFIT there you have it. A turbine MATERIAL that cost $500 becomes $2200+.