From what I know, on low volatility slots people are rewarded more frequently with smaller prizes, but they rarely get big ones(if ever). 50,000x is a very high multiplier, and if it pops up from time to time on MT2, this can be compensated only one way - by making it a high volatility slot, where smaller rewards happen less frequently. (cmiiw)
Exactly this but in this case Deadwood's volatility is extreme instead of just high volatility. In most high volatility slots, you will only gets a decent multi from the bonus round which is why its kinda hard to land a bonus round if you compare it with medium or low volatility slots.
I'd probably have rolled over 500 spins at on point for MT2 but I didnt land 3 scatters. I probably will get around 5-8 bonus rounds in Big Bass Bonanza for 500 spins.
I personally have never won anything good on Deadwood, but that's probably because I played less 100 spins on it overall. Almost all of them were losing ones or with a small payout. On MT2, on the other hand, I won $24 and $18 from $0.10 bet(my highest wins so far), and was also hitting around 50x from time to time. Deadwood is not for me, because I can't not winning anything for a long time.
