Statistically over all FFers, yes, and perhaps even for all European members (given that there's no iDine in Europe), yes also.

But there is, for example, one person over in the iDine forum who eats out typically a couple dozen times a month at iDine restaurants and earns over 10k miles just from iDine most months. Well, do the math on that and you can see that even if this was the ONLY way this person was earning miles, they would earn over 100k a year, which (if it's all on airline, which might be tricky with iDine, depending) is an international business class flight or 4 domestic US coach flights.

And while it's far from all iDine (mostly Diners Club and hotel stays with Priority Club and Hilton HHonors and car rentals with Avis), I've flown transatlantic coach once with BA and later this year expect to fly transatlantic business class with BA and both are award tickets and not a SINGLE BA mile that I have to date has been earned by flying. (For people living in the western US who don't travel internationally on business, and whose travel is mostly on their own dime, BA makes it hard to earn any miles by actually flying but actually makes it easier to earn BA miles than domestic US airline miles in many situations using partners!) However, in this case I wouldn't call my BA miles "free" because I didn't stay at the very cheapest hotels possible or use the very cheapest credit card possible...