So he can buy one on his own for $1. The advantage is that he has 100 chances to win 2 million.
In an ordinary lottery you would either have to pay $100 to get those 100 chances or in say a 50 million lottery and you split it 100 ways you're getting peanuts.
Here you have an opportunity to split 100 ways and still get 2 million!
I think his point is that the only reason to buy a lottery ticket is for the possibility of winning a transformative amount of money (eg so much that you'll never work again). So even though you have the same value buying 1 ticket for $1 as 1/100 of 100 tickets for $1, it defeats the purpose.
Of course what constitutes a transformative sum is subjective, as is whether or not that's the only reason to buy a ticket.