OK....now as to WHY I like to hunt with heavier bows.....
One, because they fit me better. Being that since I've shot bows since I was 8, handling heavier weights seems 'normal' to me. If I shoot a really light bow, its kind of 'blase' to me. I almost just 'go through the motions' instead of 'getting into' the shot. I 'get into' my alignment better and I get better performance from my release. I am more accurate with a bow that fits me, i.e. 60-70#s.
I also like to move a decent weight arrow at a decent speed, and I like to move a broadhead with a lot of cutting surface though my animals. Being that most of my hunting here in the east is thick with not a long line of site, I want to let the air out of their lungs 'right now'. And, I like to have two big nasty holes for blood trailing that sometimes never makes the ground.(or if it does, you can't see it) Meaning there's a lot of side swiping of tall grass, palmettos, weeds, vines, and small diameter saplings.
I have found that shooting an arrow of around 600 grains, give or take 25 grains, moving around 180-185 FPS gets me two holes most all the time unless the off shoulder or leg bone is hit....and if that does occur, that shot will put down the animal post haste anyway, either in site or I will hear it go down.
I have never had a concern with penetration, even with 3 and 4 blades, and have had consistent pass throughs on hogs up to 300#s. I shoot those heads through deer like they aren't even there.