True, but not only would you have a brand new airplane, you'd have 1000 lbs of useful load. You'd be able to customize it to your needs without an act of congress. As the builder, you could do your own maintenance and annuals. You would also know the plane inside and out.
I've been dreaming of building a Murphy Rebel or Elite for a long time now. The Rebel is probably one of the closest planes to the 150/152, but it still has more useful load and you can choose which engine to run in it.
No question that the acquisition cost is more, but the advantages of an experimetal are huge. This is especially true if you are not an A&P. Don't get me wrong, I love the 150/152 series, espacially my 150

It is however very frustrating at times to pay a mechanic to do things that I'd rather do myself. It's even more frustrating not to be able to make some modifications that would be perfectly safe and very beneficial.