200 Impressions for 1.5k fans is pretty good.
Its nearly impossible to get 90-99% of your fans to see your post.
You obviously havent had any previous of how status updates work, just cause it appears on their newsfeed doesnt mean they will see it.A lot of people have their newsfeed full of crap so your newsfeed gets buried most of the time and they wont see your status update, also if depends on the time zone that your status update is in. If you updated your fan page lets say 3 pm EST then ppl on the other side of the globe most likely will miss your status update because by the time they logged in your status update would be in their newsfeed for 8-15 hours so it just wont be on their top of newsfeed.
Also keep in mind not everybody checks their facebook account every day, if you are able to have 15-20% fans impression then you are doing really godo.
Much of the time your status update gets buried with alo