I wouldn’t say so, because I don’t usually remember to wear perfume unless I’m testing one! On special occasions, I will reach for one, and my favorite is Tom Ford’s Oud Wood, though I don’t know if I’d say that’s really a signature scent.
In the beginning, I definitely stayed in one brand, and a lot of that does come down to accessibility and affordability (it was MAC!). MAC is totally a gateway drug 🙂 But in the long run, no, and I think it’s better to buy the best products from all brands instead of settling for products from just one brand. Every brand will have hit or miss products as well as hit or miss shades.