I did a 10 000 km long bike trip from Italy to France through Finland. One of my biggest budget was... train tickets.
Now don't make fun of me! When you want to reach Helsinki on the 15th, and you're still in Berlin on the 5th, you kind of have to take a shortcut.
And because I had a mountain-bike with me, I couldn't hitchhike.
But with a foldable bike, I could have.
I was thinking that, with a foldable bike with not so small wheels, a luggage carrier, and a bag that can be carried on the back too, I would be much more free.