Question: cs go how rare is it to get a knife?
Answer: With the cost of CS:GO case keys currently sitting at $2.34 (If you buy them from the game itself) and the odds of a knife being roughly 1 in 400 (0.25 x 400 = 100. #Quickmaths), this means that you would need to spend, on average, $936 on keys to 'guarantee' a knife drop.