The hardest thing to solve in organization of any kind of expedition is money.
Мost expeditions, which put a ding in the universe, had money problems. For this reason many of them failed. Some lost their lives.
When the starting point is behind, the traveller appears in another dimension. It's almost like space shot. You can do nothing to solve the problem. You can only rely on those who remain on earth and offer logistical support, donate your way and your return.
Big money! You need it throughout the whole project: a pretty pot of money every month! For fuel, food, bike maintenance, visas and thousand other items, without which the way forward will stop.
Using subscribe system allows to make a budget – an expedition budget. Еvery little bit helps, the project will still live on!