With Roulette, the win chance is 50% due to the presence of the 0, so the payout is 2. With Dice on stake.com, if the win chance is 50%, the payout is only 1.98. Is the 1.98 low because the Dice can still land on the exact number 50 (similar to the 0 in Roulette)?
Roulette and Dice game concepts are completely different. The 0 is a special payout number on the roulette game. But you will loss your bet if you roll the number 50.00 on 1.98× payout (50% win chance) in the dice game. This is because of the difference of house edge concept of both games.
BTW, I had participated in some freeroll poker tournaments of Stake until now. And I have managed to win prizes from only one tournament, I had ended with
83rd rank and received $1.5 as reward.
