You can find the rules in this post -> https://blurt.blog/blurtcontest/@kamranrkploy/buy-blurt-and-powerup-and-stand-a-chance-to-win-blurtpower-for-yourself
Anyways a small reply to your queries. You must buy atleast 50 blurt from any exchange and then power it up in Blurt with screenshots of powerup as well as blurt purchased. That's how you will enter a wheel of fortune and stand a chance to win blurt power for yourself.
For now there will be no advantage of buying more or less blurt as this is just a test contest.
Okay how many entry per user.. can I be buying blurt everyday to participate?
Only one entry.