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It seems like you answered your own question? You have to pay a lot of money now for a breakeven that happens in close to fifteen years, which is close to the lifetime of the device. Which means that the value of the device to you is close to $0, but it costs you $15k. Why does that seem like it might be a good deal?

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Comes down to whether they're willing to forfeit the potential 10-20k profit from investing that 15k wisely over 15 years, if it means they're burning less carbon

If your terminal goal was to see less carbon be burned, rather than to make a good financial decision, you could presumably accomplish more of that by taking the $15k (or ~$35k after investment) and using it to e.g. buy carbon offsets -- it's much cheaper and more effective to reduce emissions in the developing world than in countries like the US.

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