I think if you start raising too much with those pairs etc. at lower limits it is def a leak. $25 NL and lower none of the players really pay attention to what position you are raising from. For example, I often raise to 3-4x the bb from 2nd position w/ AA and get 3-4 callers. This tempts me to raise even more but I find that it just gets folded around if you raise to like 5-6x the bb. I think that it is really profitable just to play really tight at these games. If you start to raise w/ AJo from early position you are going to get too much action for your own good.