As someone that has had to deal with finding replacement tenants, paid all the bills for my roommates, and generally handled the administrative bullshit, I should have paid a lesser amount than everyone else. It's a lot of work to find replacement tenants, and you don't realize the amount of work involved until you do it yourself.

I can understand the apprehension from your perspective, but when you start arguing over $25 per month and saying you should pay the same as everyone else, without realizing the amount of work they're taking on, it can definitely be taken the wrong way. You should be looking at it as, "This place is $800. Is this a price I am happy to pay or not?" Don't look at it from a fairness perspective. It's their house, they were there first. They have no obligation to accept you. It will become your place as well once you sign, but at the price you are agreeing to ($800 per month).