Upload & Sell: Off
The people it will effect are your potential clients.
It works like this, a viewer will only click so many times on your site. The happy balance is where they can see the maximum amount without it being too much.
So if you had three post per page open by the time the viewer makes their second click they are now seeing six post.
By enclosing the post the second click get them into a single post, the third click out, the forth click into the second the fifth out etc etc. People get annoyed with sites they have to work too hard to see.
The net is pretty fast these days and an 850px wide shot can look great at 250 k or less. Even with multiple images three post a page should not slow the experience down,