Is there anywhere i can check what the mining costs and how much dividens could make with 1000 bet for example? Apparently without an account or holding BET i can only see this.

And this doesn't really tell me if this is currently profitable to buy or not.
Just check the top 200 (on that same page) and you can make a calculation from there comparing how much they have, how much they get and how big the dividends pool at that point in time is.