Capitalists and collectors are villains.
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So it goes with starship construction. Starfleet vessels are built at a facility called Utopia Planitia, which orbits Mars, and ships are (presumably) constructed out of specially mined ores, specially constructed computers and engine parts, and salvaged pieces of other recycled ships. The people who build the ships only focus on making the best ship possible, and equip it with the best possible tools for its designated missions; a research vessel, for instance, would have better scanning equipment. A transport vessel would have more room for passengers.
We here in the 21st century, sadly, still live under the yoke of capitalism, and making an actual Starfleet vessel like the U.S.S. Enterprise would cost a great deal of money. Also, since we don’t yet have a Utopia Planitia ship-building facility in the present, we would also need to worry about the cost of manufacturing the materials needed to make a starship using modern means. Plus, there’s the issue of taking the pieces up into space where they can be assembled.
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This ship is going to run a pretty penny.