Said it before and will say it again +1.5 runs in baseball is the worst bet ever, it basically only makes a difference in a single solitary instance, when the team loses by exactly one run. Other than that it doesnt matter. So
odds are never ever premium enough to make it worth it.
Only time you ever take a +1.5 is if there is some weird arbitrage possibility somewhere, which even in the hay day wasnt all that often.
Because seriously if they lose by exactly one run most degenerates are going to be sweating every at bat or pitch even. If they win outright you lost 50% or more on the ML, and if they get blown out it doesnt really matter or you should have been smart and laid the 1.5 with the fave for 40-50 more cents. and cashed.
IMO +1.5 runlines are and always have been a psychological tool for books, if a guy wins one or two they think theyre geniuses because they did get that one outcome where it mattered so the bettor thinks he is smarter than he is, and he bets more or 'badly' with this new found confidence and ends up losing it all back anyway. Well if he bets +1.5 runlines in bases he will llose it all eventually, but maybe not as fast if he doesnt hit a few here and there.