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Bitcoin may be only expensive if only you want to invest what you can afford or you do not have a source of income. Bitcoin is an investment which everyone needs to cut his/her coat according to what they earn.
No, everyone doesn't have to invest in bitcoin just because everyone else is investing. Bitcoin is recognized as an asset that grows in value over time, but everyone has their own mindset and different risk tolerance. Not everyone is able to bear the risks of highly volatile bitcoin investments, most may tend to invest in assets that are safer in the long term. However, anyone who is able to afford the risks of investing in bitcoin, then they can invest in bitcoin and they will be the ones who will get the return.
Bitcoin can be expensive if you are only thinking of buying all Bitcoin, but you don't need to stress yourself to do that. Bitcoin is not expensive and it is not only people who are earning well can invest in bitcoin.
It's not wrong when someone thinks that bitcoin is expensive, of course its value is very expensive for most people. But fortunately, they don't need to buy 1 unit of bitcoin when they can only afford 1 millibitcoin (mBTC) or even satoshi (sat). They can buy fractions of bitcoin which are hereinafter known as mBTC, μBTC or sat. Of course, this is adjusted to each individual's budget, so you don't have to buy 1 bitcoin.