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it's still going to be a realtively small cost to offset that might add a few pennies to the retail cost of the rim
I suspect that the dies come to more than a few pennies per rim, my best guess would be about ten times that, so to an order of magnitude between £0.1 and £1.0, assuming they actually have a long enough production run to go through numerous dies and therefore amortise the cost of design and trial dies down to a reasonable figure per rim. You might get upwards of 50,000 rims from a die, the tooling costs become even more significant if production runs are short. DT Swiss group turnover is only about £70M p.a., carve that up over their product portfolio and lifecycle and they might never get to the end of life for a particular aluminium rim die unless it's a best seller which stays in the catalogue for many years.
If you're extruding to a design size of 1mm wall thickness and dies get replaced when that has gone up to 1.05mm, that will get to @thecycleclinic 's "seriously overweight" but it's neither here nor there in terms of the rim's function. Whatever the amortised cost per rim the die comes to, multiply by 10 if you want the rim weight to be held to ±0.5%
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gbj_tester
I am aware an extrusion dye costs around 5-10 K pounds, but even so they could replce them when due... it's still going to be a realtively small cost to offset that might add a few pennies to the retail cost of the rim