Question

Hello Rabbi,
I often hear rabbis talking about the importance of investing in this world in order to acquire the World to Come, emphasizing that this world is nothing but "a corridor before the banquet hall." But the more I try to think deeply about it, the less I manage to fully understand how significant this really is, and in particular—why it is supposed to attract me or speak to me.
After all, there are quite a few people who live good and fulfilling lives in this world. Even when there is difficulty, they know how to see it as part of the process—like a challenge in physical training or in learning. Not only do they not suffer from it, they even love the difficulty, מתוך the understanding that it leads to a good result and a deep sense of satisfaction.
There are also people who find meaning in the process itself—they live life as it is, enjoy the moments, the journey, and their personal growth, without looking for something infinite beyond it. They do not aspire to the World to Come—not out of contempt, but because they do not really understand what it is, and they have no need for something they have never experienced.
And for me this is truly an essential question: how can a person long for something they have absolutely no grasp of?
I have often heard quotations from the Sages saying that one moment in the World to Come is worth more than all the pleasures of this world, but the truth is that this statement feels distant to me. It does not touch me emotionally, it does not fill me with aspiration. It sounds too abstract, almost theoretical.
In addition, I have heard lectures by very wealthy people who say openly that there is really no significant difference between someone who earns a million dollars a year and someone who earns a billion. Their lifestyle hardly changes, and the daily pleasures remain similar. They keep chasing money only out of an inner need for competition, not because of any real lack. I feel that maybe this is similar with the World to Come: it may be full of delight, but if I do not feel the lack, I am not sure I truly long for it.
True, I have heard the claim that in the World to Come a person becomes a broader "vessel" that can contain a completely different kind of delight, a supreme spiritual pleasure. But here too the question returns: if right now I do not feel that I lack anything, and if I am content with my existence as it is—what is supposed to motivate me to change my life just for the sake of a future pleasure that I do not know, do not feel, and am not even sure I want?
I am asking all this out of a sincere desire to understand, not to argue. I would very much appreciate an answer that could shed light on this point in depth, perhaps from the sources or from life experience.
Thank you, and have a good day