Why doesn't a coin's low unit price mean it's cheap? Because unit price is just a surface number from "market cap divided by circulating supply." Of two coins with the same value size, one issuing 100 million and another 1 trillion, the latter's unit price is naturally 10,000x lower, but that doesn't make it cheaper — their overall market caps may be identical. Reading "low unit price" directly as "cheap and easy to profit" ignores the key variable of supply. What truly decides how much value you buy is market cap, not that price with many decimal places.
Can you show with a concrete example that "same market cap, wildly different unit price"? Yes. Suppose Coin A sells at $1 with 100 million circulating — a $100M market cap. Coin B sells at $0.0001 with 1 trillion circulating — also a $100M market cap. The two coins' overall size and the total valuation the market gives them are identical, but their unit prices differ by 10,000x. If you spend $1,000 on each, the "share of total value" you buy is the same. So seeing Coin B's string of decimals and thinking "so cheap, 10x is easy" is the same thing as thinking Coin A at $1 is cheap — the key is market cap, not unit price.
What's wrong with the thought "if this coin reaches the price of some major coin"? It completely ignores supply. Beginners often think: "This coin is only $0.001 — at $100 I'd make 100,000x." But what matters isn't how much the unit price rises, but how large the market cap must balloon. If the coin has 1 trillion circulating, a $100 unit price means a $100 trillion market cap — a figure far beyond all the world's stock markets, real estate, and gold combined, simply impossible. Imagining returns via "reaching some unit price" treats the impossible as easy, a mindset that has you chasing fantasies that will never happen.
So in practice, how do I judge whether a coin is expensive or worth it? Switch your anchor from unit price to market cap, in three steps. First, ignore unit price and check market cap and circulating supply to grasp the coin's overall size now. Second, imagine returns via "how many times market cap must grow," not "what unit price it must reach" — ask "to double, its market cap goes from now to what, and is that realistic?" Third, compare its market cap with similar-sector projects of comparable scale to see if it's under- or over-valued. Once you habitually think in market cap, those "so cheap, feels ready to fly" impulses get filtered out naturally.