Just sharing my opinion on what could be done.
The problems that someone pointed out of heyfonte for facebook are:
1. If 400+ is being restricted, then 0-200 should also be restricted.
2. People getting points this way aren't earning them vs. the people who played consistently throughout the year.
If we fix the first problem, then we have a new problem, we open up the problem of not being enough people to reach the 128, 128, and 256 limits, and we might have like only 100 in the younger divisions, and 200 in the masters, just odd ball numbers that aren't powers of 2.
So that's partly why we need those others that are 201+ away from invite to play, is to create enough attendance. Being a single elimination tournament, the challenge is making a consistent list anyways. If you are good, and deserve the invite, you will beat the people in this tournament. You can't prevent scoops, and helping others in any tournament, of any size, high risk or low risk events.
One thing though that I could see, is we should make sure that its first come first serve, but, if you are within 200 points of invite, you are bumped to the front of the pack. If the pack were to go over 256, 128, and 128, then its first come first serve from those people. If we were to not have enough, like say in the masters with a guaranteed max of 256, and 170 show up that are within the invite range with this tournament, then we have too few people. So in another registration line that are for people not in range of invite, the first 86 in line will make it in the tournament. That way we made sure everyone that could get an invite is in, and that we have enough people for a legit tournament with the cp points for top 16, top 8, and winning top 8.
Now there will still be scoops, but that's something about tournaments. You need to do good no matter what. Think of this as a huge 5 or 6 round battle rounds, depending on attendance. There isn't a separated top cut, you must be the X-0 to win the event. There isn't a restriction in battle roads to play on points, many go for sabotage or to help friends, this event is the same. Someone might play against people they know for all the rounds, and if that happens, how does that affect you? They will probably do bad at worlds if they can't get a legit invite, but as long as YOU run hot, YOU chose a consistent list, and YOU outplayed your opponents when it comes to that, then YOU SHOULD NOT have any problems getting your invite. As long as YOU don't lose to those who have friends helping them in the round they get match-ed up with you, you will be just fine.
Just my opinion, if you do good, and with luck as all card games have, then you will be fine. Plus you probably shouldn't be relying on unexpected last chance tournaments. This is the first time they are doing it like this, I'm sure it will improve in the future as long as you nicely suggest options and give ideas.