In reply to nniff:
Gains have to be made in some way, either by climbing or using a finger board carefully, it's really not that complicated.
Injuries in sports will obviously always happen. Having a healthy diet, and building your self up gradually in your training and climbing isn't hard.
I train on a finger board, by trying to simulate climbing in the gym, using a couple of footholds to switch between. And then I do a light just fingers session, no injuries yet, just aches the day after, like any other type of training