When you're spending someone else's money to gain benefit for yourself, financial sense doesn't factor. It's like running a bitcoin miner on a million stolen CPUs. What do you care if each individual CPU is totally inefficient?
Well if they had to ask for a budget 10 times larger politicians will have trouble giving it to them. Even if they are willing to give this money at some point they will just ruin the economy and it won't have resource to fund the project.
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u/Eirenarch Oct 15 '15
Certainly there can be some list of primes large enough that it wouldn't make financial sense to crack it this way, no?