at PD you can put no maximum amount for bet like 100 Btc or 1000 Btc as many as you want, because PD has much big bankroll for instant payment.
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Wrong, read the above posts, it has been explained by the post just above yours, please do read it
It actually is max 'bet + profit' = 20 btc. So i.e. you can bet 10 btc max on 50% odds (10+10) or 2 btc max on 10% odds (2+18) and so on.
in short, you can only get 20
BTC max profit / roll . But it seems like this is wrong either, shouldnt that 20
BTC is only max profit and not maxt bet + profit .
tl;dr it should be that the max bet on 50 % is 20
BTC since it will get you 20
BTC as well and it is the max profit for each of the roll