as for no.1.. You need to look in the long term of things, yes it will cost money, but how many religious people do you think don't show up to games because they will miss out on prayer, it will also attract more of the religious people who follow sport to the actual game and will therefore bring revenue to the sporting industry.. You néed to think long term..
uh.. how many religious people do you think won't show up to a game cause they miss out on prayer? I think that number is very small. Also, seeing as a growing number of the youth are embracing agnosticism, athiesm, or a pure indifference when it comes to religion, thinking 'long term' could be an argument against your contention if this trend continues (which I believe it will).
Furthermore, it could even discourage some racist people from attending the game, and seeing as your key argument was revenue generation, this may not be a desirable thing from your point of view.
As for no.2.. Alot of other places do have prayer rooms and so it is time that the sporting industry follow that
Why does this mean that the sporting industry needs to follow? Just because 'other places' are doing it? Does that mean I should start injecting meth into my eyeballs if everyone else starts doing it? Just because 'other places' are doing it doesn't mean it's the right thing to do. (Not saying that it shouldn't be done, but saying that 'other places' have prayer rooms isn't enough - for me at least)
As for no.4,, how will prayer room create more division in society?? That just doesn't make sense?
It does make sense, creating prayer rooms has great potential for segregation. Many people judge you on your faith, and (for some) it can change their entire opinion of you to the point where they don't want to be in your presence. There are other reasons why I believe these prayer rooms have the capacity to create division but they just seem rather obvious - to me at least.
As for no.5, what you need to understand is that a Prayer room, is a prayer room, all they need is a spare room, with like a cupboard fille with prayer mats for the different religions etc and therefore it can serve as a multireligiom prayer room, what they may need to account for is the fact that they need separate prayer rooms for females and males..
What you need to understand is that religious differences are often a breeding ground for conflict. You want to put muslims, jews and christians in the same room to pray? Isn't the potential for some people to feel uncomfortable obvious? Why not avoid this potential conflict all together by not having these prayer rooms installed? How many people are going to not attend a great game of football just because they can't pray for a couple of hours.
So as you can see, I'm for the prayer rooms as I believe that it is a really good idea to being many different ethnicicities and religions to enjoy a game of sport 
Why does there need to be a prayer room for people of different ethnicities and religions to enjoy a game of sport? Since when has footy not brought people of different values together? Prayer rooms are more likely to segregate than bridge the disparity. The game itself has always removed religious divisions through a mutal hatred of a common enemy in Collingwood (or whoever the opposing side is) - prayer rooms may even have the potential to remind people of their differences.
lol, btw I hope I didn't sound too rude.. If so, I'm sorry.
I tried very hard not to sound rude, but I wanted to, because I disagree with you thoroughly - but hey, we're all entitled to our opinions <3
Also, who'd want to pray in a separate prayer room during a footy much anyway?
over and out xo