Do You Foresee Any Problems With This Approach To YouTube Videos?

I am trying to squeeze every excess byte out of my downloads. I noticed that even with the iFrame version of YouTube videos, users have to download almost 200K worth of data.

I decided to use the screenshot stored at YouTube (replace all occurrences of VIDEOID with a youtube video):
http://img.youtube.com/vi/VIDEOID/0.jpg

HTML:

</div>

And use jQuery javascript like this:

$(".YouTubeScreen").click(function(e) {

var vid = $(this).attr('rel');

$("#vid" + vid).html('<iframe title="YouTube video player" width="640" height="390" src="http://www.youtube.com/embed/' + vid + '?autoplay=1" frameborder="0" allowfullscreen></iframe>');

});