Phoenix and Vegas are probably somewhat similar markets. Your agent could be telling you the truth. The data I have are just averages and I am sure there are some people who are buying cheaper and some who are paying more. It's just that the average purchase price at trustee sales has been trending up and you have to bid on more and more properties to get one.
I met a guy the other day who does this for a living and he said he now bids on 100 properties to get one at 70% of ARV. When you count his cost of checking out the 300 properties or so to find 100 to bid on, his real acquisition cost is probably close to 80% of ARV.