As name indicate it is personal stamp which anyone can make it " Create your own stamp". This is offered by some of the countries like USA, UK, Belgium, Iran, Nederland etc. Some countries allow label(e.g UK) with there stamp and others allow stamp directly(e.g. Netherlands,USA)
Why Personalised stamp?
This stamp is for fun to celebrate certain special event or function in someone's family such as birthday, marriage, new arrival etc.
Why Gandhi Personalised stamp?
To make MONEY.!! As there is not enough Gandhi philatelic material to collect when you compare to other thematic collection such as birds/flowers/animals/sports etc so now a days individuals are coming up with a great new idea of making personalised stamp of Gandhi and creating different postal material such as FDC, used covers etc
What is philatelic value of thie personalised stamp?
Nothing.!! ( This is just my opinion). According to me there is no limit of this personalised stamps. If there is huge demand of that stamp than it can be reprinted. Also there is no authority to control this so in future I can also print it with any topic related to Gandhi. This is like making a rubber stamp.!!
In past stamp dealer were printing out stamps from smaller countries and flooded the market, now everyone can print there own stamps.!!
What are other possibilites of this personalised stamps?
There are chances that in future someone will come up with some offending stamps with Gandhi pictures or his principles which he follow throughout his life.
Recently I read article that someone in USA came up with stamp of HINDU GOD and which is offending to all Hindu people around the world and there is no way to stop them.!! You can check following link for this article.
Now it's upto collector to decide what they want to collect and what they do want to do with their collection. Also it's upto collector how much value this personalised stamp is.