Harrahs has a nice promo going until this Sat (1/13) where you can
get a bonus 6X RC if (a) you swipe your card once to register for
the promo during specific hours and (b) play slots between specific
hours. You then have a chance to cash 200,000 RC for $1,000 in
cash. Since it takes $10 of coin-in to get 1 RC, then the promotion
results in the same $10 coin-in to get 7 RC (1 RC plus 6 bonus RC).
That translates into of 35 bp of cb. Note, you redeem the cash on
Sunday (1/14).
However, if you have RC and aren't using them, then the correct
analysis is the Marginal benefit over the Marginal costs since the
existing RC are considered sunk costs. I had about 150,000 RC
sitting in my account doing nothing, so for me, it would be getting
$1,000 in cash for 50,000 extra in RC. Since the 50,000 RC during
this promo meant about 7,143 in RC or 71,428 in coin-in, therefore,
my extra $1,000 in cash from the extra 71,428 in coin-in translates
into a 140 bp of cb and that made it strong enough for me to sit my
butt down to get to 200,000 RC.
I found out it takes up to 72 hours for the bonus RC from the promo
to registered. Also, I got the traditional bonus RC as part of my
play (but I didn't know this when I did my analysis).
Good luck