I wonder if you have ever worked with an architect before from the beginning of a project.
Basically what your saying is the same as don't get a doctor in the beginnings of felling seek. First decide what medicine you want to take and then get a doctor to give you a prescription because you know exactly what is better for you and it will cost you less.
Let me make clear some point:
1. The fees of an architect are fixed fees, so rejected layouts are part of the work and no one is charged extra for that.
2. The fact that you haven't build a house before makes you less informed than an architect to deal with such issues as quality of space, lighting, air quality, construction cost, detailing, water proofing ....but most of all, quality of the space you gone be living for a long time.
3. Expertise in dealing with issues like permits, builders, Câmara and all the other people that is involved in a process.
Working with an architect is exactly the same as working with a doctor, lawyer or any other professional service. They will give you expert advice in what they feel is the best solution for you, now and in the long run. You have the power to decide to follow their advice / prescription / project. But most of all you have to trust in their knowledge the same way you expect that the people that use your services is expecting the best service and advice you can provide.
i have worked with architects on a few things, thats why iam saying that in my experiance its better to design a project yourself, as only you know what you want.
I didnt say dont use an architect, they will of course deal with the building regs, planning submission etc side of things, what i did say is if you have the skills, design the house your self as only you know what is best for yourself with regards to layout, space design etc, once you have your on personal design, then talk to the architect to have the whole project prepared.
I dissagree with you about architects fees being 'fixed' they are not, part of the planning and design of a property envolves a evoloution of ideas as the design takes shape, if there are changes and architect does and will charge for any changes he has to make. he may make changes in the begining for free but if there are changes during the planning period or indeed the build, he will charge more for these changes.
i dont think the fact that someone has not built a house before has anything to do with good design and layout, people live in houses they know what they like and dont like, dont get good design mixed up with the nitty gritty of drawing plans to incorporate building regs, permits, builders, Câmara, lighting, air quality, construction cost, detailing, water proofing and all the other people that is involved in a process.
what iam talking about is actual design/layout, the best people to do this is the client, if they have the skills, as i have said in the begining, this is my opinion, as an architect you will of course advice people to use your services, thats normal and there is nothing wrong with that.