If your collection is over 4 cars you are not a Car Collector you are in storage business....buying Public Storage stock or storage REIT would be better!
Unless said cars are literally in garage next to house or under it...you wont drive anything over 6 cars on weekends....more than 8-10 times a year (52wks / 6 = 8.66)
I see dudes with 3 cars garages and lifts, and the top cars have not been down in months....
Im in Cali with a 4 bay, and 365 sunny days and it takes planning:
-Early morning/avoid traffic
-Take covers off, battery tenders, move remotes.
-Move cars ...like chess board
-Gas up
-take ride/get back before...
-re-park, cover, tender.
Im not even addressing washing, waxing, service, DMV/SMOG/tags, "issues"