If it's bothering you I might. Although since EB is assigned in the order it is purchased, there probably isn't going to be too much of a difference between EB now and checking in right at T24. I would not buy EB, check in right at T24 and then decide if it's worth buying one of the upgraded boarding positions. Is it a direct or a connection? If's a direct then buying the position is only $10 more than buying EB, if it's a connection it's $50 more since you have to do it at each boarding location.