It doesn't for me, unless it becomes a very frequent occurrence. I've gotten to Valinor on LOTR, but only once. The X-Men and Ghostbusters wizard modes are challenging to get to as well, so they both keep me coming back for more. On my Ripley's I've gotten Atlantis a few times now, but it still isn't easy and Atlantis itself is hard to do well in too, which makes it even better. Plus I've still only gotten Frog Frenzy once ever. My sell decisions are based on how much the game is still challenging me, how much I like an overall game and of course how badly I want a different game instead.

Funny you mentioned TF. I was going to comment before when I saw it brought up. I owned a TF Pro and I have gotten there a few times on factory settings and once I got there, I had almost no interest in playing the game anymore. I liked the game on route, so I was excited to own it, but once I brought it home and got to the wizard mode, I wanted it gone badly. Believe it or not, I even got to Battle For Cybertron on one ball once (413 million on that ball) ...that's when I really knew it was time to sell. The game just starts over and you have hundreds of millions of points but you are back to chopping wood for 10k shots. Best score I ever got was 676 million. In that game I got 97 million on Rollout and 267 million Battle For Cybertron alone. That game took under an hour. I didn't get a billion, but like I said, after the game starts over, nothing is worth anything anymore so it really isn't fun to continue playing. Plus, there are really only a few opportunities to maximize your score with the SJP shots and the roving multiplier. If you lost your ball and your multipliers before getting an opportunity, you're screwed at getting max value.

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It's give or take depending. For instance, Megatron shot has the drop target in front on the Premium so that shot is harder, but the Iron Hide ramp opening is huge compared to the Pro ramp so it is way easier to shoot. Premium you can get an EB from so many Starscream target shots that you can't get on the Pro since that target doesn't exist.