I'll add to Jim's comments by saying (1) I agree with everything he said and (2) there are two different levels of claim processors.
One, is the one man operation that finds enough local work to be a hired gun for small stores and a stop gap for larger stores when they need temporary help. The problem with this is in the states are small stores are dying very quickly and larger stores have back-up plans. The upside is there are few start-up costs. If you are friends with a few factory reps you likely can find enough work to do ok. Since you are visiting the stores you don't have computer/equipment costs.
Two, is the multi-person warranty processing house. Here in the states there are already very competent companies out there fighting it out for the available work. The market place is well served. Second, it takes a substantial investment in equipment and understanding to be able to process claims for every manufacturer on every possible dealer system. There isn't enough work in a single make to earn more than you would working in a dealership.
That being said if you're dead set on making a go of it, for just a plane ticket to Australia with a small stop over in New Zealand and small fee I'd be happy to come out and set the whole thing for you
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** Rob Campbell, Contributing Editor for DealersEdge **