Just from a quick glance, a store would make listing what you have more economical in the long run, particularly as you could then make use of the variant listing format for the things like jeans, or even the bags if they're all the same brand / style just with different patterns.
With the amount of stock (and apparent value) you have, I really hope you fully researched the marketability of them, especially within Australia. Those bags are really nice (I like 'em, anyway :^O), but I've never heard of most of the brands you have currently listed (then again, I don't keep up with many of the fashion...stuff, although I do sell clothes...). My point is, though, are people actively looking for these brands in Oz? What kind of traffic volume are you getting? For that kind of investment, I'd want to be fairly well-assured of a return, either that or simply have deep enough pockets to experiment with $30k, or have the time, energy and dedication to build up brand awareness. :8} (There are ways you can do that, but I won't go into detail here and now).
To tell you the truth, I do believe that having a store can make a difference, particularly so with the kinds of items you have listed. I'm absolutely not suggesting sellers without stores appear less trustworthy, but a store set-up allows you to communicate several things to potential buyers without the need to state them explicitly - in some ways, it legitimises your presence as a dedicated business, and as such can increase buyer confidence in your products and practices.
