Its not that they are favours. Its caused by the screwed up system in the US. The wheelchair manufacturers knows there will need to be huge discounts to the insurers. So they taking the usual price like we would pay in the UK, and basically doubling them or more. So that in the end they get the right amount! But what that does is make all the list prices for parts CRAZY as you and the public are not going to get the same discounts as the insurers. The same seems to be happening with your chairs. Base price, not much different to ours. Then all the stuff you need like say extra for 4 pole, or a tilt addon, is telephone numbers!

Because they know that the insurer will pay half of that or less.
This is what happens when you distort the free market forces that normally control pricing with complex rules and take away all free choice from the user. In a free market where the buyers is you, and every business competes to succeed and make profit, they would all need to compete for sales. Its YOU they would have to please.
Imagine. 5 companies. All make powerchairs. To grow, and sell products and make money for their owners, shareholder, etc they
must sell many powerchairs. So in a free market with no complex rules and where YOU are the buyer who now has freedom of choice we have the following scenario:
1 company makes chairs the same as the average chair, but MUCH cheaper than all the others. They will take a large market share from the walking wounded.
1 makes
better powerchairs that give the user what they at reasonable prices. They will take a large share of the market too, for those that know what they want.
3 companies make average chairs at todays stupid US prices. These will either need to change their ways or go bust. Since you the public wont buy. Net result, bad companies, underdeveloped products die off. The best compaies/service/chairs/ grow and expand. And new ones crop up if prices are too high. As it leaves a gap in the market.
Thats what free market with no distortions does. As long as the UK and other countries rely on the experts to supply free chairs and the US to rely on others to assess and choose what you get for "free", then we will continue to pay telephone numbers for simple parts, or full chairs with a much lower level of development than normal consumer products. We will never see the sort of built quality or design, or R and D or customer service or value for money we see on other consumer things.
This is why the industry, and the UKs wheelchair services are dragging their feet, and very hard to persuade to give the money to the end user. They dont want change. They dont want the user to be the boss with spending power. My original pilot scheme. They dont like it, it means they are going to have to wake up and improve drastically. And behave like a car or TV dealer/shop. Customer is king. This was supposed to be live from january this year. But it seems many people are still having a fight to get a cheque! Its happening. But resistance is high! But futile.
10 years from now, our wheelchair services will not really exist in its current form. It wont hand out, service, repair, etc. It will assess and advise, and give a cheque instead every few years based on your needs. For
you to buy what you want. So they will help the bewildered to choose, but the dealers we have now will either turn into real consumer freindly places like a car dealership, or toysrus for wheelchairs. With knowledgable trained staff that know their jobs. To help the consumer choose from the multitude of options. And they will have specialist controls, seating specialist companies or advisors that understand the market.
They will have no choice if the disabled public are all running around waving 4 to 10k around for a chair. And service will be of utmost importance too. Remember thare are many feedback type sites on the web. Bad service = customers all run away. Its called capitalism. And it works. Same reason the unemployed, disabled can afford iphones or wide screen TVs or food and clothes.