Below is a link to an article on my website. Zoso is our baseball host. I would repost the information here rather than link to my site, but I do not feel that is fair to Zoso. Anyway, the information is worth it.
Incidentally, Paula is right. EVen numbered totals are less likely, because a game can not end 3-3, 4-4, etc.
David
p.s. I would suggest using more descriptive titles. I would suggest a post title like "How much is half-run worth on a baseball total?" rather than "question for bookmakers or anyone for that matter." You will probably get more relevant responses.
Half-point in baseball totals post