Hmm, put that way it seems very believable.

I also can think about it in a way of...forbidding things sometimes makes folks want to have it more.
For a real life example, when i was 14, i naturally had a curfew. Now, it was rather late compared to the average 14 year old, but my mom trusted me. I did break it a few times naturally, and yeah, i was grounded(there were exceptions of course, like if i was at my best friend's down the street, or driving around with a couple of 17 or 18 year old friends on car show nights. Yeah, i used to live in South Jersey.

)
When i was 16, my curfew was pretty much totally relaxed. The only thing she wanted me to do was call her if i was going to be home after X time-and i always did. But the funny thing was-after it was relaxed, i no longer really wanted to stay out all hours of the night. I wanted to go home and sleep or play Genesis or SNES or something. It was no longer 'daring' to try to stay out late.
Likewise, i was much more into 'sneaking around drinking' at 18, than i was going to the bar with friends at 21. Sure, it was fun, but it lost some of it's charm.
I sometimes-even many times, see the same thing happening in tabletop games. A GM that throws a whole lot of strict rules down can have players, even non munchkin-powergamer types, trying to scratch out these points and that point and trying this. Not everyone does this; but none of us are perfect, we're all human(I think

) and we have quirks. In games that i played in where the rules/restrictions were much more lax-I rarely saw any of this. Everyone ended up making what they wanted, they ended up rather balanced(the power level of the game MAY have went up by a notch or two. But no more than that. The game didn't turn into a recreation of Ragnarok or anything), and the table was happy. Sometimes when stuff isn't outright forbidden or whatnot, it loses its charm.
To tell you the truth, Im happy making 400 BP characters at our table, with our few houserules like the Cha x 2 contacts, no Availability limit, and a couple others. If suddenly the GM told us to make 500 BP guys, i don't think i'd know what to do. I usually don't need that much(it might be fun for a one-shot or weekend game or something). I remember this happened, actually-GM was running a high powered game(SR3); I already made up my 123 point character and he said to take 200 because it was an insane weekend long oneshot fueled by lots of caffiene and sugar. I had no idea what to do with the rest of the points. I think i was buying knowledge skills in French Cooking or something by the end.
But if suddenly we were told to make 300 BP guys with strict limits, I admit, i might chafe a bit. Im sort of used to our current happy medium and one of my flaws is adjusting down-or up-to large extents quickly. (If i knew in advance, like, a month or so, I could come up with extremes on either end. Mostly the chafing/confusion on what to do is because when i get a concept in my head that I really like, I kinda want that concept and if I can't make it with 300 BP, i chafe-but if im told i get 100 more BP im clueless on what do to with it.)
But yeah, just some other musings. But NR, that does make perfect sense. Trying to reign in the munchkins(I dont consider powergamers bad people-they usually don't try to ruin fun for everyone, and most of them can be talked to and they agree to tone down-munchkins are gamekillers) can end up ruining fun for the table-and the point of the table is naturally fun.