This is one of the things that drives me bonkers. I have a prime Snell w/ skill and have been building him up over time (3 to 4 months).
Another guy from our club pulled a POTM Snell a couple of days ago and low and behold, he proceeds to crush with him during the bonus game event yesterday, vaulting our team to the top 10. While he was getting 40-80k per bonus game, I was only getting 4-8k, and I even had prime Braun and a skilled Yelich to assist me.
What’s the point of building up a prime Snell w/ skill (which states is for events) and then only allow for the POTM Snell to get those huge bonus points? I wish they'd give bonuses to the player (whichever 20 versions you may have of him) instead of just one version.