Here's a little puzzle that really puts this in perspective:
I put 100 lb. of potatoes in the sun. The potatoes were 99% water by weight. After drying a while, the potatoes were 98% water. How much did they weigh at that point?
I put 100 lb. of potatoes in the sun. The potatoes were 99% water by weight. After drying a while, the potatoes were 98% water. How much did they weigh at that point?
They offer a series of actions that let you lose or gain x% n many times in a row, with an equal chance of each. The fact that +x% doesn't cancel out a -x% compounds on the difference in lay person expectations to produce horrific odds for microtransactions.