mulching is a good thing for the lawn, adding the nutrients it needs back into the lawn. Bagging is going to remove the nutrients that can be added back in. We cut mainly bluegass/rye, it looks ok when mulched but can get messy. I have just side dishcharged in large areas such as parks or back acrage areas. In my areas some guys mulch and but its mainly the larger HOA mowing guys. On the other hand, everyone catches and it has just become the standard in our area. But it is getting spendy to get rid of. I go to the dump daily and its costing me about 9 to 12 dollars a day. Just depends on how much I bagged and growth. But you gotta charge for it if you do have to bag, there is only so much you can get away with charging but do what you can.