after playing machines for a bit, can I ask someone what my theo and coin-in are for the day?
When you say "for a bit" and "for the day" that just seems to be on a level where you are wasting their time and yours.
If it is for a short period of time you should be able to get a decent estimate just by using the points. IE: if its a Total Rewards casino and you go down after dinner, put your card in and see you currently have 480 Tier Credits... you play for the next 4 hours and at the end of the night you have 850 Tier Credits. From that you can see you earned 370 TCs, which you earn at a rate of $5 each... so your coin in was roughly $1850. You want to know your theoretical loss so you can pretty much pick a number from 0.07 to 0.12 to represent the house edge (depending on how conservative you want to be) and multiply that by your coin in.
Beyond that, when the casinos track these things for the sake of comps and future offers they don't really look at it on such a short term scale - when they send you an offer for some free nights in Las Vegas they will be looking at it like "What were you good for over the course of your total trip?" and "Whats your theoretical loss for the past three days? for the last six months?" not "What did you do for 3 hours in the casino Monday night between 7PM and 10PM?"
Also, people seem to think this info actually matters when in reality it does not: If you are getting offers for free rooms then unless you totally stiff the casino on a trip you will likely continue to get offers for free rooms... if you are not getting offers for free rooms then it means you aren't gambling enough to warrant offers for free rooms.
And knowing what your theoretical loss is isn't really going to change that: it isn't so fine tuned and exact where you can game the system, like if your theoretical loss per day is $270 or less then you don't get free room offers, but $271 or more gets them - its all just going to boil down to: if you aren't getting offers you need to gamble more, if you are getting offers then thats great.
And finally, if you are wondering if maybe you are leaving comps on the table, IE: you got the free room and a free buffet dinner per day offer, but could you have gotten free breakfasts as well? A good rule of thumb there is: If you never hear them say "No" to you, then you aren't asking for enough.
Sure, nobody likes to hear "No" to them but when it comes to comps and freebies in Las Vegas you need to ask.