@Bala murali , you may need to review your perception of "cheat".
Opening "multiple" demat accounts would be cheating only if the linked PAN cards belong to same person.
Opening accounts with PANs of family members or friends or other forms of consensual 'groups' can't be seen as "cheating". By that logic mutual funds would be "cheats" too.
That is being resourceful, using the power of group, and usually benefits the entire group, not just an individual. Sometimes not even 'The' individual. As such it is a positive thing perfectly in line with Bharatiya culture and ethics that is usually appreciable. Ofcourse exceptions are everywhere but exceptions shouldn't be generalized to make a good thin look evil.
I have opened 4 demat accounts including mine within our family. Intend to open two more while usually 2-3 retails is all I can afford. If one of those accounts get an allotment, I intend (haven,t sold any yet) to just get my principal back and the profit is theirs to keep. Sometimes all is theirs to keep. That is my way to contribute to my family and I am the youngest in my family. (So 'My family' is to be interpreted in Bharatiya perspective, not Western where 'my family' only means 'me' 'my "current" spouse' and 'my kids').
Hope this comment will be read and interpreted with a positive mind.
PS.
I've got 0/4 retails, and have no complaints, as usual.