It actually has nothing to do with youtube itself, but how addmefast gives you points for youtube views.
Lets walk you through the whole process, so you can get an idea of the flaw in their system.
First, after you are all logged into your addmefast account, you would go to
http://addmefast.com/free_points/youtube_views.html
Then in the html it would show you a link to a video in ,pretty much where it says "view video".
Now when you click on that link, it will redirect you to a link something like this
http://addmefast.com/getUrl.php?i=JTI1NTklRTAlREElMTclOTElODQlMTZ5JUU3JTgwJTJBWTElM0IlQzYlQjAz, then that link will do
a 302 redirect to the youtube video link to something like this http://www.youtube.com/watch?v=HH6Hh23DV3U
Now, it always waits 30 seconds before addmefast calls its next url, so it doesn't matter if the youtube video wasn't opened or played or if it was even playing an add. It will always wait 30 seconds, without checking anything.
So after those 30 seconds are up it does a POST to the next url
http://addmefast.com/includes/ajax.php
POST : act=checkFollowed¶ms={"id":"230226", "url":"HH6Hh23DV3U", "network":"5"}
(this is the url that is called after 30 seconds, if its called before 30 seconds it will give you an error saying that you didn't watch the video for the required 30 seconds, if you call it after 30 seconds from the previous link you will get a 1 as a result which means true or good to go)
Then, after that the same url links is called but with a different POST
http://addmefast.com/includes/ajax.php
POST: act=showImageCapt¶ms={"id":"230226", "url":"HH6Hh23DV3U", "network":"5", "code":"UV9W49sW%2BoUceOqAIUE8PMzZWfvfeyRtn0ToX%2BRhHg%2FXLu6sg8NslGt%2FChQ%3D", "link_id":"54b126204b45240124bc18f6230226", "cpc":"10", "link_title":"ClickAdvertPls"}
(This is the link to get you a random tic tac toe captcha puzzle for you to solve, this is required to get the points for the view. This was supposed to make it harder for certain people to get easy views but not for everyone like me lol)
After that, guess what comes next? You guessed it, the same url is called but with a different POST
http://addmefast.com/includes/ajax.php
POST: act=checkCaptImage¶ms={"answer":"TtnfXZL1mhiHeZM0rPN8zGhQh7Hzu4QW-_-5", "id":"230226", "link_id":"54b126204b45240124bc18f6230226", "url":"HH6Hh23DV3U", "network":"5", "code":"UV9W49sW%252BoUceOqAIUE8PMzZWfvfeyRtn0ToX%252BRhHg%252FXLu6sg8NslGt%252FChQ%253D"}
(This is where you submit your tic tac toe answer for the captcha puzzle)
Then , the same url is called again but with a different POST
http://addmefast.com/includes/ajax.php
POST: act=updateAction¶ms={"link_id":"54b126204b45240124bc18f6230226", "url":"HH6Hh23DV3U", "network":"5", "IXY5pZpE":"UV9W49sW%2BoUceOqAIUE8PMzZWfvfeyRtn0ToX%2BRhHg%2FXLu6sg8NslGt%2FChQ%3D"}
(This is where addmefast updates its system and add the points to your account in their database, and to update their backend with the current action that was completed)
After that, you call the same exact url but with a different POST:
http://addmefast.com/includes/ajax.php
POST: act=getLikeNote¶ms={"m":"1", "cpc":"10", "title":"ClickAdvertPls"}
(This is to update your browser with the message that you just earned x points which changes the html)
Then, you call the same url one more time to begin the process all over with a different POST ofcourse:
http://addmefast.com/includes/ajax.php
POST: act=getYoutubeVideos¶ms={"network":"5", "page":"1"}
(This is to get a new youtube video url in your browser with a new link on the "view video" button)
So after all those steps, if you are smart enough to figure out why this whole thing is flawed you would see the obvious flaw in their system.
In other words, you can call http://addmefast.com/getUrl.php?i=JTI1NTklRTAlREElMTclOTElODQlMTZ5JUU3JTgwJTJBWTElM0IlQzYlQjAz and avoid the http redirect(302) and just wait 30 seconds, without even opening the youtube video, then call the next addmefast links and you would still get the points.
So with that in mind, I suspect if you spent 100 points and you were paying 8 points per view, then around 3-4/12 people were not smart enough to cheat or were really honest addmfeast users that earned those points the way addmefast wanted the points to be earned. Sadly, the other people didn't want to waste their bandwidth or open up a youtube video because they probably didn't want to waste any cpu cycles on your videos due to how much cpu and ram flash usually takes.
Now , I hope everything is more clear as to why you didn't get your views, is not because of youtube but because of how addmefast actually gives you points for views.For that reason, they had to do the tic tac toe, because before that it was even more easier to get points.