I cannot tell exactly why people do what they do, but i think people buy Bitcoin after the halving and when the price begins to rise, because they prefer to buy assets that are rising, so they can make profits immediately and sell. The people who buy in this way do not really believe in Bitcoin and they do not want to hodl it, but they basically just want to earn ROI in the short term.
This amount is more than enough to have an air-gapped or hardware wallet, and as for an air-gapped wallet you do not even have to spend money to get one, you can create one for yourself with some of your old devices.