Why would you care about the tankers? The engine costs around 2 million dollars rounded up, that means the upper stage won't cost significantly more than $20 million.
The only thing they have to reuse is the booster. That alone will get them the Artemis 6 contract. Once you have reused the booster, you can do as many reentry tests as you like, even if it is just for fun. For every saved booster, you can do three reentry test flights and still break even.
The only thing they have to reuse is the booster. That alone will get them the Artemis 6 contract. Once you have reused the booster, you can do as many reentry tests as you like, even if it is just for fun. For every saved booster, you can do three reentry test flights and still break even.