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Such a thing does not need to be assumed because most people can also see that at this time there are already many rich people with deep pockets who want to buy Bitcoin without thinking about the expensive costs. Because people who already understand Bitcoin will never stop buying Bitcoin and they will even continue to be enthusiastic in buying when they see the price of Bitcoin which has increased. But if you do not have deep enough pockets to be able to buy Bitcoin in large quantities, you can still buy it little by little because that can also be a good option for people who do not have that much money.
Previously, you had to differentiate between price and cost. Price is the value of the bitcoin itself being traded, while fees are the amount you have to spend to make transactions with bitcoin on the network, or also trading fees. Anyone can buy any amount of bitcoin, but you will definitely find exchanges setting a minimum amount. Anyone who knows about Bitcoin's long-term potential will likely invest in it, but no one can force you to invest if you don't believe in this potential.
Whether or not someone invests heavily in bitcoin also depends on how well they are able to weigh the risks. They may have sufficient budget power, but they should not invest in bitcoin using all their money without any consideration.