I drive a Toyota Camry, and I'm happy with it. Thus, there is nothing more to gain by buying a fancier, more sporty car.
This is infallible logic, as applied in this thread to audio systems.
Of course, this vehicular and audiophilic logic is driven (pun!) by one thing, a desire to save money. When the OP's question is viewed in this fashion it becomes immediately obvious that one's current satisfaction with the sound has no relation to potential for improvement of a rig, nor to the cost of the system as an absolute predictor of sound quality.
Yet, we have mass delusion in this hobby in that everyone thinks their rig is right at SOTA sound. No one wants to admit they are a long way from the upper echelon.
I'll go on record with this one, given how many CD Players and DACs I've used, old and new; the OP was told in a nutshell that what he's got is good enough. Ok, that's a 2001 era 108kHz 24 bit player - not bad! However, If he takes that advice, he'll neglect the fact that he could go out now, and for about $1-2K, and some at $300-$500, get a 32 bit/384kHz or better DAC that would blow the doors off of the MF player. Have heard it? No, and I don't need to, as my opinion is that having heard it against several 24/192 players/DACs holistically the technology is so far superior to the old that one can nearly universally be assured that the new DAC will vastly outperform, with of course consideration needing to be given to the tonality of the particular DAC as it's integrated into the rig.
Oh, my, that's a real budget buster, an example of what would likely be less than what he spent on the MF player, and a boatload of improvement!
And that is but one example of the types of improvements - enormous improvements - he could have had. :(
Now, if the OP's left the building, taking along the smug assurance that he needs never look again for something better, he'll miss out on it all. Ignorance is bliss, right?
Yeah, he's got his "Camry" and there's really nothing better in terms of performance out there. :(