for them bitcoin is just a form of investment and a great way to earn money.
but if you will ask them even just what is a blockchain they cannot explain it.
that is why they cannot really promote it to other person since they dont know it for themselves too.
therefore those of us who has knowledge must continue on teaching others so that it will be known to all people..
There's a reason why they don't know about those stuffs -- They are not interested about it. For them bitcoin is a mere form of investment and so that's how they treat it. They don't care what's going on under the hood. They don't care about the nodes and all that and that shouldn't concern you at all. It doesn't even concern them. What I realized is that as time goes by and the more bitcoin becomes like a usual currency, the more the technical part of bitcoin will be neglected. Supply and demand is just common knowledge, so people would know how bitcoin's price is determined.
We don't have to teach them at all. Just imagine a teacher trying to teach Math class to an English major student. The reason why he/she took English as a major is because that's what they are interested on. It's not that he's totally not into Math, it's just that he's not interested. This is analogous to people only wanting to learn about the investment and money making aspect of bitcoin and not the technicalities.
Convincing people who are ignoring bitcoin would only result to loss of time. Like what you said, if an individual is uninterested about a certain topic or discussion, they will not listen no matter how beneficial the thing really is. Most people do not know bitcoin since some are just plainly ignorant, others do not have any internet access which hinders their capacity into knowing things, or some are just unsatisfied and uninterested about it. We cannot blame them since all of us decide for ourselves but they certainly miss the opportunities waiting for them.
It is very hard nowadays to convince people into investing, considering that bitcoin exists within the internet. Nowadays, there are a lot of of scam sites roaming around in the internet which contributes to their decision, thus making them doubtful and skeptical. But once you show them actual proof or evidence that you really earn (like receipts, proof of transactions, etc.), then you might be able to open their minds and change their heart, perspective, and attitude towards bitcoin.