Honestly, nothing surprise me at this point. Where I live, every pregnant woman has at least two baby showers (and one of my good friends was upset that she HAD only two!) whether its their first, second, third, whatever, child.
I think the grandma baby showers would be a very nice gesture perhaps for women who don't have many, if any, family members (beside their expecting child, of course) but I always feel the same about baby showers and the opposite is what happens. The people who have massive support systems already in place, large families, coworkers, friends, church groups, etc, basically the ones who don't need any extra help are the ones down here that have multiple showers with entire stores worth of gifts.