Yes that is the most common situation that occurs, but if you really want to invest you can set aside even a small amount, maybe $1/day, I think you have that amount every day for now, and if accumulated one month has $30 to invest, it doesn't have to be a large investment, small amounts are great and safer but if you do it consistently I think you will get a pretty good return in the future.
I'm not sure but I haven't used a platform or exchange that allows us buy $1 bitcoin hence I believe you're talking about having to safe and gather the money and you'll agree with me that there are expenses and challenges that aren't budgeted and are very necessary to solve and it might be relatively impossible to have such money and not solve such problem, hence I believe it is easier for someone who is financially ok to invest than someone trying to make ends meet.
Of course it is not possible to buy $1 of bitcoin every day, it is an act of not thought, and yes there is no exchange to facilitate that, what I mean is you put aside your $1 or fiat every day and accumulate it in month, and you will find a point where $1 you collect every day for the better at the end of the month to be exchanged against bitcoin, it also depends on someone respecting the money, even a matter of pennies if you collect will get a decent amount of change money you shop.
The mindset of consistency that needs to be applied even 10$ in one month, unless you really don't want to collect it and really not want to invest, the average person thinks that investing must be in large amounts, but in my opinion, even if someone has financial circulation minimal, if he is determined he will do it.
I believe you must be confusing savings with investment, now let me clear you on this if you don't mind, the necessity to have a portfolio with hodlings irrespective of the amount in bitcoin is to flow with the tides, and the concept of bitcoin nd cryptocurrency generally is to buy low and sell high and of what essence will it be after saving your $1everyday till it gets to $30 at the end of the month when there are possibilities of bitcoin raising to an all time high while trying to save?
I also do understand that we have to save to invest but I don't think that principle works very fine with buying bitcoin especially for someone who barely have to eat a day, should I save even to starving myself because I want to invest in bitcoin?
Guess no, and that is where my point about investing in bitcoin is more easier for people who are stable and not people struggling to make ends meet.