I'd love to buy more collars, but don't have the money. Gavroche has an Ella's Lead collar that I ADORE and it's all he ever wears; it was mostly paid for with a gift certificate I got for my birthday. I'm hoping to get another one this year so I can get Logan an Ella's Lead collar or a Braid-a-Roo tag collar. I'm fine with having one good leather collar. I do have nylon/chain martingales I use for training (and working, in Logan's case).
I have a leather harness for Logan to wear when he's working, but I recently had to get a nylon one because the leather one is rubbing somewhere. I may just need to punch holes in the leather one, but I'm seriously considering selling the leather one and buying a biothane one. I have one vest that he wears that fits well with the harness.
I do have several leashes, because I'm very particular about my leashes and if one of them breaks, I need to have a backup ready to go. So, I have two leather Euro leads from Onlead, a bullhide slipleash from Onlead, two ecolead slip leads from Ella's Lead, a thin leather leash of unknown origins that I LOVE for training, a bullhide show lead for Logan from Onlead, and two backup show leads (one is a nylon slip lead, the other is a silver snake chain with a thin nylon leash...I love the collar part of that one, hate the leash part). I also have an Ella's Lead Liberty's Attachment for Logan's harness (used as a bridge handle), but it doesn't work with the nylon harness I'm using for now.
I also have a few waterproof collars and a plain nylon harness for each dog to use when we're going to be getting wet and nasty so their good stuff doesn't get messed up. Gavroche also has a car seatbelt harness (I use Logan's everyday harness to buckle him up).
When I no longer want/use a collar/leash/harness/vest I try to sell them. Gavroche's EL collar will NEVER be sold, it's too unique and means too much to me. I love it to bits.