That's an important consideration as well, though.  It probably tips the scales in favour of the current chain, meaning that even though 2x might end up with more miner support initially, it almost certainly won't have as much business and economic support.  As I said, this isn't just about what some miners are doing, it's about what everyone participating in the Bitcoin network does.  It's about which chain provides the most incentive to actually use.

As an example, if loads of payment processors, merchants and other businesses end up deciding to not support 2x, then 2x probably won't provide enough incentive for the average user to transact.  Users want to be able to spend their coins and they can't do that if most companies won't accept them as payment.  If users aren't transacting on the 2x chain, then as a result, miners will earn more fees on the current chain, so they'd go back to that and forget about 2x.
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