There might be many attractions for a Pixel Gun 3d fan such as having to get unlimited gems and coins to actually upgrade your gear, weapons and armor without any limit and above that also have the ability to customize the attire such as hats, etc. without having to wait and first earn the required number of gems and coins, and then being able to do whatever you like.
However, there are much more serious reasons as to why one should never use a Pixel Gun 3d hack and this is because using a Pixel Gun 3d hack has a lot of risks attached to it! One of the greater risks is that as you would know that the game works online and as there are thousands of players online all the time, there are servers which are always online keeping a track and transferring information from and to the game at all times. This online server also transfers information of the earnings that one player makes and if you use a Pixel Gun 3d hack to increase the number of gems and coins that you hold in your account, these online servers will obviously capture the immediate change and transfer the information.
Nothing might happen immediately but in a few hours or days, this change will be detected and steps will be taken against your game id. These steps might be as serious as putting a ban on your id, not making you able to play with that id again and also make you lose all the progress you had made in the game! Using a Pixel Gun 3d hack could also lead to a permanent ban on your IP address because of which you will never be able to make a new id or play through your internet connection! Therefore, it is better to not use a Pixel Gun 3d hack.