yeh would guestimate you will get at least one 50-47 on every card, the most common score by far is 49-48, which would work out at first two rounds even and winner taking two of the other three rounds, you see a fair few 49-47 also if fight not so close.

The whole scoring issue is a tough one and i can see both sides points, I think if you want to score it as Muaythai then the Thai way of scoring should be the benchmark if you want to call it Muaythai, on the other side of the coin though, there is no denying whatsoever that the system used today is badly flawed and slowly killing the sport off. The crowds are nowhere near what they were 15 years ago and purses for fighters half of what they were back then. Your average Thai that doesn't want to gamble has no interest in going to watch when a lot of the fights literally as you say have two guys that hardly fight for first two rounds, up the action a little in the third, have a strong round 4 and then spend the final round dancing around waving there arms a bit and grinning at each other. Or you get a guy score well with Muaythai technique for 3 rounds, but in round 4 get dumped on the canvas by brute force once or twice and that costs them the fight. The Muaythai press in Thailand has articles on this often, complaining what was once an art is turning into glorified wrestling. Many gym owners walk away confused after fights as to how their boxers lost, you have things like what they call Naa sua that has too strong an influence on the fight, where a fighter from a certain camp or with a certain sponsors name, being harder to beat than a boxer from a small relatively unknown camp out in the sticks, say a boxer from a big name camp with a strong reputation and known for betting big, the opponent from the smaller camp will have to do more to beat him. Often camps complaining about the odds being too strong, sometimes a boxer winning every round clearly, but the other boxer being more favored by the gamblers having the odds still in his favor.
We had a boxer fight on a Onesongchai show this week and at the morning weigh in was sat with Songchai and a few gym owners and Songchai himself said if he had his way he would have the boxers fight so they had no influence from outside the ring, and the judges sat ringside unable to hear or see what the gamblers were doing odds wise, have it so the fights were scored every round and again scored with no outside influence.Some of the points being brought up here by people about how it is scored are the same being brought up here all the time by Thai's and the evidence looks pretty clear that it isn't particularly working to sell the sport to people outside of those purely coming to bet. There is a small trend now here too to make the fights 3 rounders and when you talk to people behind it they all say the same thing, it makes the fighters fight from the off and makes the fights more exciting to watch, this isn't just coming from the people that promote these fights, its coming from experienced judges saying the same thing.