You might be the lucky one sitting beside a Millionaire and get a free flight instead, I’m sure he learned a lot from you and that’s why he become more generous in return. Investing can be in many ways and crypto is just a one option there’s nothing wrong to ask since we all start here and for sure that guy is already asking his financial assistant to look for further details about crypto, and being rich you can easily hire someone to handle your finances and you’ll survive it.
Ideas and money are two different things, and in this case I would prefer to have money without any ideas because ideas can be learned or gained from those who have it. For example, the OP stated that they pay for his flight; do you think the OP will resist if the man asked for more ideas from him? No, because of the kindness the man showed him, he will decide to open everything. I don't think all business people originally got the idea of what is paying them now, they get it from people who have it but no money to implement it. Money speaks louder than ideas; if you have money, you are open to a plethora of ideas, whereas ideas are difficult to sell because you don't know who and who is interested in business because there are many ways people generate income; drawing their attention to your own idea, they will see you as a foul who is attempting to play smart; it is much easier for a person with money to succeed than it is for a person with an idea, if at all.
Someone who have the money, have only one part of the success and someone who have only the ideas but don't have the money also have one part of the success, meanwhile someone with both the money and the whole ideas have the both success and the success can't workout if the person isn't discipline.
What I am trying to say is that both the money and the ideas are completely important and one can not make good success out of it without the both of them.
Sometimes having both combined does not guarantee success because of certain risks that are involved, we are all discussing the success of investment and we are not looking at the risk, this alone can make the investment not to work through, now getting the money and the idea then the next thing I think of is location, because for example, you have the idea and you are able to convince the rich man in the locality and the business will not sell well in the locality, This is how the investment failed while both were involved. The reason I bring this up is because when the rich man lives in a rural since not all affluent people live in towns, those rich people in villages are all farmers who produce a lot of money through farming.