It could be well over 3x as well depending on btc price on mid May. If it goes down below $28k close to $27.5k then most people would bet on the lower range hence the odds for the range that you picked will get higher odds before the end of betting so yeah it could be over 3x and its really feasible at this point as we have been getting close to $30k for some time but never really stays above that range
I think betting on bitcoin price predictions is still too early so the Outcome Odds looks high, you should bet at the end of the prediction so you can get the Outcome Odds that match the original, because for now it can be high but at the end of the prediction everything goes down. so your winnings are also calculated based on the Outcome Odds at the end of closing, not at the start.