Well, that's because different miles and points have different values and some miles and points are worth more than others. (travelcodex.com)
We've talked about this before but there are actually tons of different redemptions available, which is why it's important to have a stable of different miles currencies. (pointswithacrew.com)
Note that Nepal is considered part of the Indian Subcontinent, unlike the other locations listed above, and therefore has different miles requirements for travel than «South Asia» or «Asia 2 ″. (pointsaway.com)