But exactly why he's so dead set on the Tendo engagement is a mystery. What does he get out of it? Really?
I've been wondering about that one for a long while too. What are the benefits?
First of all, the pact. What is it about exactly? Uniting the schools or the families?
Why would Genma still want to unite the schools after meeting the Tendo heir? Compared to Ranma Akane is a novice and except for the ominous 'taking out blunt weapons from an undisclosed place' technique Akane has nothing worth adding to the Saotome school.
Why is Genma so dead set on Akane although Ranma was offered the choice in the beginning? Apart from some fighting skills she's untalented in almost anything else.
What could Genma get out of the pact? The dojo? I don't think so. First of all, the dojo belongs to the Tendo family, and I don't really think Akane (and especially Nabiki) would let it go over to Ranma. In fact, I'm sure Ranma would have to take the Tendo name if the marriage should ever take place.
Genma is greedy, I agree, but why is he so dead set on the pact? It it were only for money he could simply sell Ranma to Kodachi and not have to work for the rest of his life.
For honor? I don't think so, or he would not have sold Ranma to all those other families.
Conclusion? PLOT HOLE!!!! Once again.