When a beginner knows that bitcoin is expensive, it implies error from whoever is introducing him into bitcoin. There are some unnecessary information you don't need to release to a newbie which he will definitely learn in the process but by then he must have understood the system and also understand that bitcoin price does not mean anyone must have 1BTC to be an investor. Learning bitcoin investment from the wrong hands is worst than not learning at all because it affects all your activities and perceptions about bitcoin and often can lead to a permanent withdrawal from bitcoin investment. It's even better to trick a newbie into it than give him a demoralising information that could make him doubt the entire process.
Your last writeup is what I don't understand, what do you really mean by trick, are you talking about tricking a newbie to invest in an investment that every individual investor is personally responsible for their decision or action, I don't think you got it right in this one, are you for real?
There's nothing demoralizing about Bitcoin investment, the only problem some newbies face is lack of understanding about the whole Bitcoin investment concept and I must tell you the truth, if you want to tell anyone about Bitcoin investment, you must tell him or her things that he or she needs to know, nothing should be hidden, as a matter of fact being open to an intending investor help him to know that he has to invest and shouldn't expect any kind of return in short while, also as he is investing, his mindset should be centered on a long-term, though I agree with you that a newbie can not learn everything once but the dos and don'ts should be made known to him so that he wouldn't be expecting magic to happen once he gets involved in the investment.
Mate my advise to you is that if you've anyone you want to introduce to Bitcoin investment, make sure you tell him what you know about the investment no matter ho devastating the truth could be and allow him to take his decisions whether to invest or not to avoid being blamed for tricking them in without explaining things as it is for them, so be guilded please.