I really did not intend to be dismissive... so I hope that is not how you took it.
[Hopefully you could tell that I a) took time and effort to try to carefully explain some things and b) did not intend to speak to a tech-only audience.]
I didn't think you were being dismissive, but I do think you jumped to the (reasonable) conclusion that I was just another clueless and lazy noob. Consequently, what I was asking and what you answered were only somewhat related.

What did you mean by the calculator and wallet "appear to be different"?
Maybe you meant the calculator fields are a bit confusing or seem mislabeled?
If so, I tried to indicate that in an earlier post:
More less; more specifically, that the data input fields on the calculator do not match the data output fields of the wallet:
1. PoS difficulty should be given in the "triangle" tool tip, not in the green check mark. I did not hover the mouse over the green check mark because I just assumed it was only telling me it was connected to the network and synced to the blockchain.
2. "Number of Coins per Input" in the calculator is not given by the wallet.
3. "Number of Inputs" is given in both.
4. "Age of Transaction" in the calculator is a single field; the same data in the wallet are presented as min, avg and max (with no contextual definition of those words - ie, one would have to know that min age is 1 day and max age is 16 days; presumably, then, avg is 8.5 days).
5. Finally, the wallet gives coin weight in days while no corresponding field is found in the calculator.
Absent a full understanding of the whitepaper, then, it is not possible to be sure if the output of the calculator is even realistic, much less correct (insofar as a probability estimate can be correct...) so playing around with the numbers and fields on the calculator is unlikely to prove enlightening.
I guess I would say, people who want to use TZC don't need to know anything about the PoS. Just as they would not need to know anything about all the intricacies of PoW/mining--how to select/purchase/build systems, how to troubleshoot myriad OS/driver/etc. issues, how to calculate expected profit with all the uncertainty, and so on. If someone wants to buy something with TZC, they would simply transact--no need to know those details. So to me, the comparison to using the US dollar holds?
On the other hand, if someone wanted to invest in TZC, that would be different. But prudent investors--for example investors of a company stock--are expected to understand a lot more about their investments and those companies than a simple user of the same company's product/service. So it seems appropriate to have at least a somewhat higher expected threshold of self-education and understanding?
Yes, you walked down the path I intended you to (cue the Admiral Ackbar quote now)... There is a use case in my analogy that falls between that of the casual user of money and the investor in securities/derivatives/currencies/whatever: the person "investing" money in a savings account or CD. This type of investment requires minimal knowledge and minimal oversight* and seems to me the closest analog to staking coins for a chance at receiving a block every so often. Hence why I am pressing for a clear and simple explanation of how to figure out the equivalent of an interest rate that one is likely to receive from x number of coins, of y days maturity, held over z period of time.
* - aside from a few months in 2009 and a few years in the early 1930s, anyway...