Squared bonus point systems like Nevada don't work much, if any better than a random draw.
Take a look at the last 5-10 years of NR sheep tags and where those tags fall. The top point holders may have a .5% better chance than those with less points. But, there's so many more applicants with 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, all the way to 1 point that your statistical "advantage" is very slight in the upper point pools. They also square all their points, so it waters down your odds to the point that realistically, 1:150 odds even with max points is probably where you're at.
Its like this say, you're the max point holder with 20 points...square that 400 numbers in the hat. Lets say you have 50 guys with 10 squared is 100 points...those guys have 5000 numbers in the hat between them.
Your odds of one of your 400 numbers being pulled is 400/5400...the odds of that tag coming from the group of 50 is 5000/5400. You have a pretty good individual advantage of being drawn over any 1 of the 50 with 10 points, but as a group, they hose you.
Squared point systems don't favor top point holders much...statistically irrelevant and probably a waste of money to even buy points under such a system. At best, all you're doing by buying points is making sure your odds don't get any worse...but its pure fantasyland to think a squared bonus point system greatly favors top point holders.
After about 15 years, a squared bonus point system it essentially a random draw.