Take your pick from any of the following, one or more as befits your situation:
a. Variety is the spice of life. Some of us purchase a sold or lost or damaged scope a second time, but we rarely have two scopes that are the same. Each scope offers a promise unlike the others we own;
b. We learn as we go. As with all intense pursuits in life, we teach ourselves and forge a path through the pursuit. Often that means the acquisition of an implement of some kind. In our hobby, they are eyepieces and scopes;
c. Different scope types offer the user a novel or unique experience. I have used the words, ...whispering sweet nothings...' in other posts recently. We look for magic where none exists. It's a siren call that must surely be present for any hobbyist in any milieu. We are always looking for magic, for better, for 'Wow!';
d. Often better is definable and realizable. Yes, it usually costs as well, but it's attainable. All that's missing is assigning to 'better' the motivation and the justification for what is ultimately going to cost a lot more....usually. [The law of diminishing returns is at play, but some of us want that last 4-10%);
e. Last, but not least....FOMO. I can't imagine dying and missing out on the promised excellence. It's a bit emotionally immature in a way, but as I age I become more secure in some ways and less secure in others. As life gets shorter, some of us want to grasp the brass ring we've disdained reaching for previously. I am guilty and my hand is raised.