Numbers first. At $0.20 per spin, 310 spins cost $62 before you statistically reach one bonus round on 1000 or Super Scatter. The original Sugar Rush needs $65 (323 spins). That is the minimum session budget to see a bonus at least once. In practice, variance means half of sessions run dry, half see two or three bonuses.
Scale it up. At $1 per spin, the same 310 spins cost $310. At $5 per spin, $1,550. Most players underestimate how long 310 spins takes when the base game is bleeding 1 to 3 percent of bankroll per spin on average. Plan for double that budget if you want a realistic shot at hitting the bonus twice.
Bonus Buy changes the math. At 100x stake, the standard buy costs $20 at $0.20 stake, or $100 at $1. The Super Buy (Super Scatter only) costs 500x, which is $100 or $500 at the same stakes. Expected value matches natural play over thousands of triggers, but one unlucky sequence of cold bonuses can drain a bankroll faster than base game grinding.