It's crazy how stupid pricing has gotten these days, an assembly like that could be gotten for under $200 a few years ago.
A lot of it is opportunism. And "efficiency".
Basically: US labor is expensive, so just make everything as easy as possible to replace.
Also, make everything bespoke and custom, so the aftermarket folks like MARS don't eat into your profits.
Also, don't plan for the future when labor costs overseas eventually rise.
Also, make everything physically larger so it costs more to keep a fully stocked supply house with all the parts that one needs to repair whatever is currently on use.
The pricing is, as is plain to see, entirely not reflective of the actual cost to produce these products. This is obvious, because so much variability exists in the marketplace in regards to how much the part costs from different vendors.
The vendor is relying on the fact that these devices are generally required to ensure, you know, that people can survive. Live. If your induced draft motor dies, your heat source dies, and quite possibly *you* die. It's like a hospital: you're generally not going to shop around if you're under duress. You need the thing, and they have the thing. It's a great way to extract a *huge* markup from a customer.
The repair shop gets to add their markup to the part, and they aren't incentivized to look around for a better price, because that's labor and labor is expensive.
That, and they would much rather be able to sell you a *Brand* *New* piece of equipment, cause their markups on those are even better.
Word to the wise though, even if you have it repaired professionally: if that thing is in an enclosed space, make sure you've got a CO alarm in that space. Truthfully, it's best to have those in every room in the house. Combustion is no joke, carbon monoxide can easily leak out of a poorly maintained or poorly repaired piece of equipment. But that's just an overall recommendation for any house that uses combustion as a heat source. Or has an attached garage.
That is, depending on how much one cares for being alive. I woke up at 4:25 this morning, so I'm about 50/50 on that at the moment.