Offers from GU - are huge price differences normal?

Who removed the time limit from the offer?

That was a local provider, Dürr Massivhaus

Yes, and 150 grams for 150% of the price feels better to me and doesn’t cost the manufacturer proportionally more. Win-win – that's my method...

But you could be more economical with the 80% as a consumer (cold cuts//own effort); the entrepreneur appeals to a broader target group (budget buyers).
This is basically exactly how it works in the construction sector with the descriptions of construction services. In the medium term, it has become established that, for example, in EL the floor coverings that were still included 20 years ago are often installed by oneself versus cost-saving potential. The builders are happy to "save" something and be able to build an affordable house.
Hardly anyone can afford the 150% anymore.

Yes, it must be clear that this goes hand in hand with a different target group. In house construction, there is then no longer enough volume to keep a nationwide general contractor afloat. A small regional one with a sharp market positioning can operate more economically this way.

That was a local provider, Dürr Massivhaus

I can't find right now whether I have already discussed it myself, but it is at least mentioned here:

Does anyone here have experience with U-Haus in Pforzheim?