The fact is you can't expect everyone to buy into your advice, even if it's useful.
People who have a budget to spare will likely be willing to buy and accumulate bitcoin on a dip, while this opportunity will be missed by those without a budget. This is the reason why not everyone will buy on the dip, so don't blame them.

Sometimes I also have to pass up the opportunity to buy on a dip just because I don't have the budget. Of course I regret it, but it's okay because investing should not be forced at all. The need for more funds for other things makes it difficult for me to save money in certain months, so I can't buy forever even though the opportunity is there.