So going by your numbers again (which, by you admission require a large purchase, and likely far more than the 50,000 units WotC is going to print)
No, it doesn't. "A lot" is 10,000 sets.
It's under $1.00
You let me know when someone says it's free.
We're working with actual numbers, they are real, they are backed to direct links and actual deep knowledge on this topic. You've strawmanned it enough - nobody said it was free, I said the same thing I am saying now for the third time - it's under $1.00 total factoring in all costs and profits. Here it is again: $0.19 per set of 7 dice (all the sides including percentile, all shipping, all customs), in a small bag, to their door. Multiple that by 5, you get $0.95.
All I said is "that's not expensive". You started this part of the thread saying it was, I've corrected it, my correction remains the real answer here.
And, again, there's still the cost of assembling the dice with the box as neither the dice manufacturer or the book printer is going to do that.
The cost of tossing a bag of dice in the box? Come on now. You've dragged this out long enough. You want to use some of that extra $0.05 you have between the $0.95 and $1.00 for tossing dice in a box, be my guest. There is simply no calculation here that adds up to more than $1.00. And a buck is not "expensive". We're all OK with a buck for dice in the set I think.
And this still ignores the fact that, according to Mike Mearls, it takes eight months to produce a boxed set.
That's not what he said (we've had that discussion already too), but it doesn't matter. This has nothing to do with the dice discussion. They are producing a boxed set, and we're talking about the cost of putting dice in it. It will raise your price by about $1.00. You can deal with that, right?