I'm not going to talk you into spending money on stuff you don't need. My only other point would be "resale". In general, shops are not dollar for dollar value adds, but I've also seen a nice shop be the differentiating factor in a home sale. Your boat alone, a higher door means not taking down the tower (assuming you're not doing that anyway, which might be the wrong assumption). Car hauler - dunno what the height is typically on those, but thrown an RV AC unit on it, and I'll be 10' might be an issue.
I have a truck camper now, I'll bet it's somewhere between 10-12' high. We built our shop for a 5th wheel though.
What about resale? A big shop with 10' doors would be a no-go for me. Doesn't matter if you'll be keeping it for the next 20 years though - you do what you need.
Do watch the lift thing - people here can give you better advice than I can. My neighbor has a lift and I know that one big factor was being able to "drive under" it with substantial height clearance... IE - if yours sits lower than 10', it might limit parking the boat, not that you don't have another space for that.
Last thing I'll say is that roll up doors ****. They rattle like ****, seal poorly, etc. Get panel doors.