as
https://coin.dance/poli is showing now for example if I understand it right (I looked not into the right page, sorry, see my next post)
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.
An attacker (let's call this Government A) bribes miners into mining at a loss, the chain of a fork, in order to push this fork as "the real Bitcoin on all major exchanges, which are also bribed by Government A, such as Coinbase et al. These miners seem to be mining a less valuable coin, but they are making more money doing so by accepting the bribes.
This is an attack on bitcoin, and this will explain when you see any miners mining segwit2x at a loss in the following weeks.
Or, it could just be that miners have done the math and have worked out that a short term period of mining at a loss is worth the risk if it means they had the potential to reap anything up to double the amount of fees they currently collect once transaction volumes rise. There are many possible explanations, not just that one. It's also worth noting that each miner will be doing their own sums based on their own personal overheads and costs, so it won't be the same calculation for all of them. But the basic formula is pretty simple, more transactions means the potential for more fees. A tempting prospect for any miner. It doesn't always have to be a government conspiracy.