Ok.. I found the thread.
Here is a quote by Barry.
[ QUOTE ]
If you allowed a break-even player to buy in for one-fourth the normal minimum, he would easily be come a winning player, whether in limit or no-limit. The times that pots would be won because of being all-in would far outweight the times that an opponent could be bet out of a pot.
[/ QUOTE ]
And the thread is at:
link
Note that he really isn't talking about min buyin, he's talking about short buyins that are allowed in some cardrooms.