I often hold my tongue in these threads, but wanted to add a few things.
First and foremost, the OP knows wire can be purchased cheaper, yet still chooses to spend his money there. No one has been ripped off, no theft has occurred.
Second, while the $1.00/ft wire might bring a margin of "1000%", this certainly doesn't mean every item in the store does. I'm sure most other items bring a much smaller margin.
Third, as another poster mentioned, the store isn't in business to sell wire. If they were, they'd call themselves "Lightning Vapes". They're not raking in mountains of moolah selling kanthal.
Fourth, the OP isn't even sure he will like 24ga coils. Seems to me that spending a buck to give them a try is pretty reasonable. If he likes them, he can place an order online for them. The overall price goes from $.05/ft to $.06/ft. Hardly a big deal.
Got a lot more, but it's late and I'm tired. Maybe I'll make a three-cent coil before I retire.