La Flo, I think that's part of the risk that Alberto is willing to sacrifice. He is a great champion. And he is most likely willing to take that risk. It's like when you want to invest your money buying a stock. You take a calculated risk because the stock could crash or going up. I guess the reward outweighs the risk
It's true, after his ban, he hasn't gotten to win any other GT other than La Vuelta. But that's why we love Contador. He is not Andy (waiting for Andy to resurrect is like watching a paint dry). Contador will bounce back like no body business. And when he is back, he is better and stronger. The proof is in front of us. He was below his standard last year, and even got his head stomped by Froome at TDF and Nibali at TA. This year, he has been flying.
Stress, sacrifice and bigger chances to a failure is what a great champion thrive on. If he can't handle that, he wouldn't have won so many GT.
btw, you aren't off either, Contador himself said that the tour is the race that gives him more grieve.