Unrelated to your example (tl;dr): most people find it exhausting to use their brain for actual thinking. They use it for excercising simple prejudice.
People are willing to spend or sacrifice for specific goals with good chances of actually reaching them. Otherwise they would turn away, unimpressed.
Also, the measure of how good the chances must be, and how specific the goal needs to be, is very diverse between the cultures and societies.
So, less is more: limit your scope to 1 country and culture, restrain your goals to specific and realistic ones, and you can achieve a lot with many followers.
The most cost effective ones are not exactly on the market.
You order the parts and the needed tools/devices from the land of the free mail order businesses, and then you follow some youtube tutorial for instructions how to build your battery. Saves you thousands.