OK, so now when a newbie looks at 1 BTC says: " I will never be able to own that! Too expensive!" - yes because people are willing to have 1 coin but how about if we make people understand that even owning 0.01 BTC can bring good wealth to their lives in the near future... I mean yeah it's great to own 1 BTC or more but that doesn't mean it's not great owning 0.1 BTC right?
The people can invest any amount, no matter small, because the profits percentage they would get would be the same.
And as the time passes by, people may invest or earn more according to their needs, because 1 BTC goal may be difficult but not impossible !
In real life, though, you can't invest any amount
First, you can buy only a certain amount of coins (so-called minimum order size) and at most exchanges it is in the range of 0.001-0.01 BTC (you can calculate for yourself how much that will be in dollars). Further, hefty fees make it meaningless to buy even that much (or little) since you won't be able to withdraw this amount. And if you take into account these circumstances, you will inevitably come to the conclusion that buying less than 100 dollars' worth of bitcoins would be an exercise in stupidity and absurdity