I don't see any value in these.
'social networking sites' - I'm not sure how you would monetise this, and I don't think it would be worth spending the resources to do so.
'debt consolidation australia' - debt consolidation is a good area for leads, PPC etc (not my area but I've seen people do well in that space) - but I think the domain is way too long and the search volume for this long tail term isn't high enough to give any value imo.
'aboriginal dot paintings' - Indigenous art is a growing area in the art scene, but right now it would be difficult to monetise given the lack of affiliate programs in this space, and it doesn't have the search volume to make much off PPC without a lot of development - and I don't think it warrants development. 'aboriginal paintings' or 'aboriginal art' are the terms you would want.
'business banker' - 'business banking' is the term you want, 'business banker' isn't commonly used and I don't see any good monetisation strategy for this one either.
I don't think any are worth developing and I don't see there being many buyers for them, hence my no value appraisal. The '.net.au' extension certainly doesn't help some of them either.