Mister, do not underestimate garage tinkerers, they are not all the same.
At same time, scientists are limited by their knowledge that they accepted as immutable, offten disregarding premises and asumptions for some Law to be apsolutely correct. Once those premises and asumptions change, Law become unapplicable.
Sometime theory also completely disregard everyday facts (I remember talking to Astrophisicist who explained to me that there should be spent allmost limitless energy to produce one Photone of light, and I asked him "Are You sure this is so?" and he was quite sure, offering me mathematical proof for this. I just reach electric lamp switch and turned light on. "Have I spent unlimitless energy to produce this light? If I am not creating the Photons, where they hide before I turn the switch on?" I asked... "Really, see that!!" was his surprised answer.) and "Ideal" things assumed sometime have logic flaws because of which thing would not work at all.
Case in question is Betz Law and "Ideal Turbine" which is supposed to have "limitless number of Blades" (which could not leave any space for air to flow trough turbine).
I invented turbine with much greater efficiency coeficient than Betz Limit of 0.59, but it were not first turbine that bypassed this limit, first was turbine from my great countryman, Engineer Nikola Tesla :-))
That depend on Idea, of course. I have idea for new kind of Geothermal Power Station, and that, I agree, would require huge resources, financially.
But in case of my turbine, smaller models for generators up to 10 KW could be made with hand tools and a welder if necesary. CNC plasma cutter would be still much better and more precise, and welder is still necesary.
If Orvile and Wilbur Wright have done that, still nobody would fly except in baloons, since science of their time claimed that it is not possible that objects heavier than air could fly.......
To my great countryman Engineer Nikola Tesla scientists also told that AC motors and generators could not exist.
You can have all knowledge there is and not be able to invent anything, because one can find more reasons why something cannot exist then why something should exist.... For me, it is not hard to invent something new that work, hardest part is to explain how it works, specially to scientists that lack imagination and unable to think "out of box"...... Instead of forrest, they see just trees, and no matter how you dissect and study each tree, there you cannot find a forrest :-))