Unless you have billions and billions of gold doubling won't work. Even if you had this crazy supply of gold the other person would probably walk once you win a couple stakes. About 6 years ago I would do a few small stakes and get a loosing streak and then go into my normal staking routine. That worked for a bit but I still lost everything I had (220M).
i find it best to select an amount youre willing to lose, and use it all on your first duel. youll end up 50/50 in the long run otherwise. this way you lose it all or double up and walk lol. seems to be okay for me
Most people use a tentacle whip, so it'll be easy to find a stake that way. Make sure to check their inventory for anything that seems strange, such as a hasta, etc. Check the amount of the stake before you accept. Spam click your opponent, and don't lose more than you can afford.