If it makes them, you, me or someone else feel good to do something and it isn't hurting anyone, then I ask why not?
Good on you, or them, or whoever, another bike bought, it makes people feel good, perhaps it took you/them/anyone forever to save, a reward, or any number of (fill in your variant) reasons. But again the main point is do it I say. You’ve obviously scratched an itch by being able to ride and feeling pretty good about it so don’t have your high wrecked by what you may think people are thinking.
We see around us everyday where people have invested in something be it clothes, sporting equipment, watches, whatever else.
I am perhaps considered old(er) and I like my bikes nice, farkin nice. Re speed and ability I will say I can hold my own and then some.
My personal curse with bling goes back to the 70s and early 80s where I would walk home 10kms 3 times a week to save bus and train money so I could buy nice parts from places like PRM BMX. Now the opportunity cost is greater with family for when I look at upgrades or new toys.
I do it because I like it and it makes me feel good.
Did you ever think the younger crowd was looking at you thinking, “respect! I hope I’m able to get out and ride like that guy when I’m a bit older”.