Firstly, since you are not disposing of rubbish quite often, sometimes it will be a bit hard to judge how many cubic meters of junk will be. If you hire a smaller skip bin, some waste may still need to be kept in the property; whereas hiring a too big skip bin, means you are wasting space and money.
Secondly, piling up all the unwanted things, you may find paintings, rotten hard wood, metal, appliances, cardboard, etc. All kinds of junk can be put into a general waste skip bin, then end up in landfills. However, rubbish removal services can usually separate the junk, like cardboard, green waste and metal can all be recycled, hence reducing the waste to landfills.
Thirdly, when you put the skip bin on driveways or roadside, sometimes others may add up their unwanted things into the skip bin before you know it (especially in some suburbs).