It's the idea of spending so much money that is stressful.

Public transport that I can afford doesn't stress me out at all.

Seriously, I can go on two round trips from London to Paris on the Eurostar with 1,200RMB, or use it to fly to Spain and catch up with my grandmother - and have change to spare.

If I haven't yet pushed across sufficiently forcefully the fact that I do not have much money, I apologise. I really don't know how I can make this clearer.