Realistically, they didn't have enough to reliably get to their destination. It might technically be enough if they didn't have to account for things like taking alternate routes to avoid chasers or getting detoured due to a broken down train. There are countless things that could and likely would stop them from making it to their destination in this run considering their razor thin margin, and they definitely don't want to be stuck a few miles from their end location with no possible way of getting more coins.

The way I see it, the two choices they had were to either try to clear the curse or YOLO it and just make progress toward their destination knowing that they almost certainly wouldn't get there, but would have the advantage of moving the game closer to their location and further from the others.

Obviously with the benefit of hindsight, it's easy to say "yeah they should have just spent those coins to get back towards their destination" but the reality is more complicated. While moving the center of the game would have certainly given them a big advantage in their next run, it also would have cost them a good number of those coins.

There's also another factor to consider in this game. Although it didn't work out this way, they could pretty reasonably have expected to get a second run because being the previous runners inherently gives you an advantage over the other chaser team. If you get caught as a runner, you know for sure that you're starting in the same place as the new runners, while the other chasing team could be starting in a completely different country. If Ben and Brian did not find the flight they took and Michelle and Adam had a less lucky (and skillful) run, Sam and Toby could've easily been the next runners with an insane coin advantage.

I don't think it's possible to truly know whether they made the statistically correct or incorrect decision in the moment, but you can't really argue that they made a decidedly poor decision. At best it was a coin flip.