I'm tired of this illogical crap being spewed as making sense.
"The more airtime you purchase, the cheaper it is to acquire the SIM from SIM4travel. The price ranges from £5.99 for the card with £20 worth of airtime, down to free if you fork out for £50's worth."

It is NOT cheaper, it is 30 Euros more expensive. There is difference between something being cheaper, and something being cheaper, OVERALL. Besides, how can it be free when you have to dish out 50 Euros for the "free" item? The cost of the free item is that you have to buy 50 Euros of airtime. It's like a bastardized version of bartering.

I will show now my disdain by telling a joke:

A farmer drove up to a manure salesman and asked,"How much." The manure salesman replied,"Well, the more you buy, the cheaper it is." So the farmer said,"In that case, keep loading my truck until it's free."
"The more airtime you purchase, the cheaper it is to acquire the SIM from SIM4travel. The price ranges from £5.99 for the card with £20 worth of airtime, down to free if you fork out for £50's worth."

It is NOT cheaper, it is 30 Euros more expensive. There is difference between something being cheaper, and something being cheaper, OVERALL. Besides, how can it be free when you have to dish out 50 Euros for the "free" item? The cost of the free item is that you have to buy 50 Euros of airtime. It's like a bastardized version of bartering.

I will show now my disdain by telling a joke:

A farmer drove up to a manure salesman and asked,"How much." The manure salesman replied,"Well, the more you buy, the cheaper it is." So the farmer said,"In that case, keep loading my truck until it's free."