i can think of a few reasons:
1. The quality/ durability, i love my epi piece (not limited to just epi), it holds up so well, i carry it everyday everywhere in all kinds of weather for 10 months straight and it still looks new to me, no change in shape/ colour, i truly believe i can use it for at least 10+ years
2. It is a very recognizable brand, it does represent success to some extent
3. I love the designs, so beautiful, elegant, neat, timeless and useful
4. The luxurious feeling i get when i use them, lv is known to use the best material to make their bags and that extra shine, softness etc. Does make a difference
happiness is not about how much you have, but how little you need.