Maybe you seems to have forgotten different countries has different currency and all currency doesn't have same value, you may come from a country which currency is very encouraging while accumulating your Bitcoin and there are also people who's currency are not encouraging. Perhaps the word expensive shouldn't have been used but rather huge and then again, since you said Bitcoin is divisible that means whether it is expensive or huge it can still be afforded so the fact that I said it is expensive or rather huge doesn't mean one can not afford it but considering the currency or fiat of other countries it is really huge. This shouldn't be a bone of contention but anyone who wants to invest should really be serious about it and stop checking the price since they are not buying a whole of it at a time.
This is not a matter of currency value; you can still be in a country where the value of your currency is very low, like mine (NGN), and still be accumulating more than those who are living in countries where their currency is high, and even if you don't have money to be accumulating high, as long as you can still afford a little Bitcoin, it gives you the opportunity to buy as little as you can, and if your funds are very low that the person can't afford to buy any unit of Bitcoin, they should use their money to eat food and forget about investing in Bitcoin and spreading the news that it's expensive.
I do know that currency value affect the quantity of bitcoin an individual can get but this is really not much of a huge factor. For instance, someone in the US might be able to buy more bitcoin with their average monthly expenditure than someone living in a place like Nigeria will do with their average monthly expenditure. Similarly, what 1BTC will acquire for someone living in the US, even less than 0.5BTC will get it for someone living in Nigeria and some balance will still remain. In order words, average hourly pay for someone living in the US may be around $15/hr but that of someone working in Nigeria is less than $1. So, the higher the currency, the more costly things, the living expenses, the lower the income and by extension the lower the quantity of bitcoin the investor can get even though the purchasing power will always be similar to people living in other parts of the world.
What is paramount is for the individuals to plan his finances and acquire bitcoin base on their discretional income without bothering what someone else in other countries are doing. We must appreciate the peculiarity of our places of residence and act accordingly.