Nothing of interest in the first hand, just for fun.
Second hand is actually debatable, but worked out well for a 460bb pot.

Unknown player who sits down at the $200 6max table and starts raising every hand and potting every flop. Whole table realizes that they don't have to work for their money anylonger but just wait for a hand to stack the guy.

So at some point I call his raise with A567, and the flop comes 468r. He bets, one caller and I raise to $100 or so. He snap calls. Turn is a J, making a flush draw possible. He check-calls his last $80. River completes the flush, and he shows 2367 with 23 to the flush.

Now a while later I've rebuilt my stack to $440 or so, above player has donated left and right, and one other player is sitting on $500. I get [Kc][2s][2h] in the SB and call the raise. Flop comes [Qd][8h]. I check, now deepstack leads for $16, and two players call. I decide to flat call here (discuss).
Turn is a , but luckily it gets checked around.
River is another . I lead for the pot, and now deepstack quickly makes it $180. Folded to me, who shoves (discuss). Deepstack ponders for a while but then decides to stack off with his QQ.

I still think there's a case to be made for flat calling the first bet, given the number of opponents, the stack sizes, the fact that I'm out of position and that almost half the deck will be a scarecard. And the added deception, of course, since I virtually always play big hands straightforwardly fast.

Question: Would you play the same hand differently at $50 buyin say?

Well, maybe we can agree on one thing, namely that a checkraise is not a good play in that spot? I think leading out is an option, so that you can either keep the pot manageable or 3bet all in on the flop.
But first, everyone had been waiting to trap the bad player. If I lead out, I announce to the other big stack I like this spot. He's not getting it in on this flop without a big draw, and then we're just flipping for double stacks. That makes no sense given that there is such an obvious target at the table.

If I checkraise this flop and the big stack calls me then the turn and river are nightmarish unless I fill up.

And at the $50s things might change a bit because on average players don't adapt well to stack sizes, so maybe I would be slightly more inclined to bet-3bet.