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I spent the gems as soon as the opportunity was offered, and haven’t regretted it for one second. And I’ve only got about 2,400 at the moment! Having that 4th TF has helped me complete the spark run several times when I otherwise wouldn’t have.
On top of that, you’ll (presumably) be able to increase your bonus % in the spark run more quickly, since you’ll be spending your sparks on smaller incremental promotions for your 4th TF.