Quote from: coinrevo on January 08, 2014, 04:45:11 PM

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A mining pool might decide to include them as a way to increase their average fees per block.

That would be quickly become knowledge and the mining pool would hopefully lose all their business very soon. With that logic an attacker could use a lot of fees to launch an attack successfully. Much above average fees would signal bad tx's immediately. A lot depends on the visibility of actions of miners. Which is why the supposed selfish mining attack was not considered really serious.

Agreed. A pool that accepted double spends would quickly be shunned by the community.