Spiders and Luck.
I think this comes from England where they have a similar spider. The Money Spider is tiny, so small that you have to look twice to see if it's an ant or a mosquito. They are lucky, but luck can be good or bad. The Money Spider crawling on to your hand means money, but which hand? We give with the right and receive with the left.
And some of them are outright just pretty, and incredibly amusing to watch. A lot of Australian wildlife hasn't been properly recorded and documented yet, we found more than another 100 species of spider just in the last 10 years. Here's one of the newer ones:
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