Quoted from 85vett:one word - tilt
(under the game malfunction analogy) - In those 20 seconds you have just as much chance (probably more) that a game malfunction could award a sensitive tilt just as easily as it skipping your bonus. If your bonus is high enough to cover a win, then just take the win. How many times have you seen a situation where someones bonus would cover a win and they got into the game and tilted out (I've done it more than once myself)? I've seen it dozens of times thus why I say my strategy would be to just take the win and move on.
Yeah but drain =/= tilt. I would argue that if you can't discipline yourself on not tilting a potential win you should practice it (I know I for one needed to learn it). As far as the malfunction analogy, the issue is if you have a bonus malfunction its very hard to prove it or compensate it without footage, concrete witnesses, or some other proof, and even then some tourneys might consider it a minor malfunction and play on. Conversely a machine that is tilt malfunctioning without you inducing it it will be easy to troubleshoot and prove, so as long as YOU don't tilt, theres nothing to really worry about - I've played some seriously tilt sensitive machines and with practice and discipline I can honestly say I've never felt cheated by a tilt that happened when I did "nothing".
For me, knowing your bonus is enough for the win means you don't go for any saves (not even a nudge - let the ball go where it may) not that you take your hands off the flippers and walk away. By draining to collect bonus you are trusting the code and the machine and your complete knowledge of both; I now trust my ability to not tilt more than a strange machine. It's personal preference at the end of the day, but I use the bonus as a buffer or a backup, not as the win-button - I always try to play to the win, and if I drain I pull my hands off the machine to avoid a tilt and hope all is awarded properly.
Tron is still an anomaly in this with the 20 second double scoring thing as you are actually surrendering points by playing on. I cant say I would 100% NOT consider draining to collect it... That is kinda why some people feel it's a glitch.