As an Australian:
1) Protect against logging and data retention laws
2) Avoid ISP legal universal blocking regimes
3) Shop for and compare cheaper prices: many places implement what we call the 'australia' tax, artificially inflate the prices when they see we're shopping from an Australian location. This is independent of actual tax collection issues.
4) Torrent: Australian's frequently access shows via torrenting still because our licensing/supply regime gives us a vastly sub-standard catalogue, and you can't access individual shows without signing up to full carrier packages, and we can't sign up to the international carrier's catalogue
5) Avoid data-shaping/non-net-neutral policies
6) Easy International and Geo-IP Testing
7) Logging onto services in public places via public wifi or access points
8) Accessing services during international travel
9) Accessing media explicitly geo-blocked in our country
Your solution (i believe) additionally doesn't meet the criteria of being able to egress from multiple countries/sources, nor does it cover the users who don't want the extra step of setting up the VPS.
I haven't checked, but i'm guessing a VPS comes at a far higher price for less (out of the box VPN specific features) than a specialised VPN provider.