I would give up my seat on a bus not only for there comfort but also if the bus stopped suddenly and the elderly person was thrown over then we would all be inconvenienced and delayed

Certainly. I would expect my children to do likewise too. I would also give my seat up for a pregnant lady or anyone who was infirm or disabled.

It means I can take many shots without worrying about the cost of development and also I can view the results straight away