This is the reason why i left most RP's, cuz of the time difference. I live in the Netherlands as you might know. With America its 6 hours or more depending were you are. So, if you are posting, im in my bed, sleeping.
But I got a solution. Taking turns. Like, first me then someone else, then me again. And if someone joins in, he/she goes last.
Now there are usually 4 or more post between mine. Then i feel kinda closed out...
But its just a thought, I dont know if it will work... And ofcourse, the admin(s) will deside ^^