No point, all CD players sound the same!
Apart from the fact that turntables are great bits of engineering and there is loads to look at and tweek the main reason is probably cartridges.
To get the best from my records I would ideally like a choice of three carts, an Io, and SPU (Jazz doesn't sound any better) and a dedicated mono cart for my collection of mono records.
Three carts means three arms and that really means at least two turntables.
The turntables themselves all have different characteristics too.
Plus I think the reason some people have a lot of turntables is because they can