If bitcoin is too expensive, then what are we to say about the other altcoins which are more expensive to invest in because of their higher risk on investment, sometimes we could not just afford to make investment n other coins than bitcoin because of the risk involved in them, while bitcoin has been made available for everyone to invest according to how they can afford to without having the fear of missing out.
Either you will accept the risk or will accept the higher cost, people want to take huge money by using little Money so this is not possible with every type of coin. Lower worth coins never have surety that they will double your invested sum so due to this reason people often like to invest in bitcoin.
Although it is expensive, it can clearly increase your profit but if someone doesn't want to buy such expensive coins then there are also some other choices like Ethereum, BNB, Solana and many more but selection needs some research for accuracy therefore don't forget to search well before Investment.