Nothing warranted your hostility? Anyway, the post (not the comment obviously) is asking how much impact coins have on the game. Answer? A lot, the exact number is not known but general consensus is 0.5-1% per coin, which on an average laptime of 35 seconds, could save you 1.7-3.5 seconds per lap. If you've ever played a racing game, that is the very definition of dramatic, grinding some time trails will even reveal that fact to you.

If you still haven't noticed the dramatic difference 10 coins makes even in multiplayer, that's a skill issue on your side.

And then maybe, if you get good, you'll notice some coins have less importance than others, but in general go for the coins, they will help you gather momentum and dramatically increase your chance of winning.