The amount of money you get from the Spinner, should you spin for money (which most of us do 9/10 times) is the amount of money you can trade 15 ECs in for to the "Nurse," minus a zero. I wasn't sure whether someone else had discovered this or not, so here it is, possibly again. So if you want to know how much money you're batting for when you spin, now you know. Remember to minus one zero from the amount the "Nurse" will give you for a hefty trade of 15 ECs.
I'm not sure how accurate it is for every body. My fiancée brought it to my attention when she got that amount, minus the one zero, and I got cash from the spinner, too. Mine was the same amount, minus the zero. I just know it was that way for the both of us, didn't know if anybody else had noticed it, and wanted to share the information, just in case.
I'm going to assume, then, that since you get 6bil with 15 ECs, for other people who also get billions for ECs, you'd have to take out two zeros, instead of one. I get 420mil for 15ECs and 42k from spinner.
Its just 10% of what the nurse gives you. They used to have 10%/20%/25% or something but a while ago they make it only 10%.