harvey: Yup - I agree. Consumers value choice in such things, and if they value it enough there'll be money to be made in setting up a competing chain, or competing store with some kind of decent differentiation from Starmart.
In this case, markets will work. If people don't want to go to Starmarts and there's neough of them, something better will appear. Maybe you're right TVP, and if so, Starmart won't make money and Caltex will end the venture. In the meantime, support the smaller operators if you want to keep 'em going.
In Wellington we have Citystops, incidentally - sometimes two doors down from Starmart! They offer a similar service, except they're only 7/11s usually, except the one on Courtney Place. Personally, I think the Starmart venture has been good. I'm all for 24r stores and knowing that wherever you go, if you see the familiar colours/logo you know it'll be open.
Found it quite useful when I was up in Auckland for NYE.