also you can bet 100 clam on that it will go below and if you win you get 800 clam
I don't think you understand how it works.
So far there has been one bet. They bet 8 CLAM on "no".
If you bet 100 CLAM on "yes" and nobody else bets, you win the 8 CLAM that was bet on "no". That's all.
It's the same as if you bet 1 CLAM on "yes" and nobody else bet. You still win the 8 CLAM that was bet on "no".
You can see this using the on-site calculator:

It shows that betting 100 on "yes" gets you back 106.92. That's your 100 plus the losing bet of 8, minus fees of 1.08 (that's 1% of the total bet amount of 108 CLAM).
So your profit would only be 6.92.
If you bet 1 CLAM on "yes", you'd get back 8.91 for a profit of 7.91. Only 0.09 would be taken in fees (1% of the total bet amount of 9 CLAM).

So it turns out the less you bet the more profit you make - if you're the only one betting that side.
Also did you see the graphical representation of a 0-8 split?

That's just weird.

0 should look a little smaller than that!
It feels like a poorly-done knockoff of bitbet.us, without the action. Even the bet itself is a direct copy:
https://bitbet.us/bet/1121/clam-losing-grip-sells-0-0029-or-lower/when im betting on price of clam i want to bet with clam
The problem with that is that you're unlikely to get anyone betting against you. If I think the price of CLAM is going way down, why would I bet in CLAM? I would sell my CLAM right now and buy BTC, or something that I didn't think was going way down. Otherwise even if I win the bet against you, I lose. I would effectively be saying "I think CLAM is going to be worth nothing soon. If I'm right, pay me some worthless CLAM, and if I'm wrong take my valuable CLAM". Nobody will (or at least, nobody should) take that bet.