That could be pretty easily abused, imagine, by straw men siphoning state money without any prospect of winning.
At least in Europe, there are campaign financial limits so things don't get too out of hand. Corruption, therefore, is done via other means.
The stated problem is actually more pronounced with a larger number of parties than 2. If the governing party is strong, but doesn't have majority, and the opposition is split, they usually need to trade favours with the opposition parties to get anything done.