Obviously this depends on a lot of factors but if you do this once every 60-90 minutes and a good BB/hr rate for micros is 1-2 BB/hr you might be unnecessarily draining .5 BB every 60-90 minutes you do not have to. I'm too tired to try now but I'm sure you could filter PT to show how often you posted when not in SB, BB, or the CO and find out for sure any +/-EV.

Comments added in edit: I do not do this for the reason above. There are enough tables out there where you can take an extra 30 seconds to find an open seat where the blind will hit immed. or w/in 1-2 hands.