Money train isn't too good to me. Once, I got a persistent collector but the bonus round ends early, same goes when I got a persistent payer (enough to pay back my intial fund in buying the bonus feature), while other players got both and had a long play in bonus round giving them huge winnings.
Welcome to the club then!
We're already familiar with this, for instance getting persistent symbol I'm hoping to get one of the kinds rare symbol all the time "Collector + Payer". Never get this symbol, If you got this symbol I believe the multiplier will be insane.