Well out of interest, I counted the green dots at 15:55 hours 25-09-14. There are 1,907 available seats. Take into account hospitality will be some 600 short, segregation, along with QPR not selling out, then right now around 30,000 would be the number. I presume there will be a few takers between now and kick off but we it will be around the 30,250 mark maximum.
PS. I can see green dots while I am writing this.