Hong Bao Hyper Bonus Hon Bao is a game and on the left side there is a feature you can activate called "Hyper Bonus" It is like buying a bonus game. Costly but usually comes with a decent payout. I find I usually buy it for 302k and get back like 285k on average. BUT it allows you to get events done much quicker and that is the real value in it.
HBHB is great for quickly completing the win requirements for events, but I don’t know why you would use it for gem accumulation. It requires so much more attention than just autospinning.
I usually go with the 150 million bet (or 151; whatever it is) and almost always come very close to breaking even with the occasional larger win. it helps get through the scratcher events really fast at least.