Originally Posted by mooper

This discussion, and similar ones that have come before it, are moot unless you both have access to a card(s) that will accept dozens of charges per day, and are willing to work for miles accumulating at a rate that equates to a salary less than the minimum wage.

Let's assume that you don't even need to charge a dollar... you find a merchant willing to accept 1 cent charges. Not only this, but you either have a card that is flexible enough to allow, say 50 charges in a day, and/or you have enough cards that you can make this many charges. Let's also assume that you are efficient enough to process each transaction in 30 seconds (swipe your card, authorize, repeat). I'll also assume that you value miles at 2 cents each. With this perfect storm, you could spend 25 minutes per day earning 50 miles worth $1. That's the equivalent of making just over $2 per hour. What's that, you say? You've come up with a way to process 100 charges per day in 20 seconds each, and you value your miles at 3 cents each? That insanely rosy scenario still leaves you with 100 miles worth $3 earned in roughly half an hour, or the equivalent of $6/hour.

The bottom line: I can't see how it's worth considering this, given that 1 mile (a couple of cents to most people) is at stake each transaction, unless you can find a way to get the time required to make each one happen down to a second of extra effort and then you are able to multiply this effort by thousands of transactions over time.