Thanks for your input, but we (and our members) are comfortable with our present procedures, which do not overburden our volunteer moderator resources during the overnight while also ensuring that all but the most querulous of our members remain satisfied and protected.
May I ask why, as a concerned member, you have never reported any of this spam that troubles you so? If you're not part of our solution, you are part of the problem . . . the very problem you are now using the limited resources of your time and intellect to complain about?
If you remain truly distraught by encountering a smattering of obvious spam amongst the thousands of legitimate posts during the late night hours, which we then remove with a very few hours of its appearance, may I suggest that you simply skip over it?
If you are somehow unable to resist simply skipping over the infinitesimally small percentage of, again, obvious spam until it is promptly and permanently removed in the morning, or somehow unable (or unwilling?) to pitch in and use the report button on same, the one remaining solution for you is to quit our forums which disappoint you so and move on to one of those other sites whose procedures you so admire . . . unless, of course, it is a site from which you have already been banned.
You moving on would, I daresay, be a mutually beneficial solution. Seize the moment, good sir! There is no time like the present.