Yes but in the walkover the manager may get to choose the minutes, but that is not helpful for training at all.
A regular game may be gambling, but at least you have a chance of getting full minutes, and even if you don't get full minutes you will almost certainly get more minutes than in a walkover.
Yes but getting 100k extra cash each week isn't realistic :P Having injury free walkovers is realistic, who has ever heard of an injury occuring in a walkover in real life?? Simply wouldn't happen.