I have been buying a few big scale cars lately for the same reasons you mentioned.
I purchased most all on ebay, all were priced good or won an auction. Two 1/12 Cords one been in progress for 10+ years, another purchased for about 50 bucks a few months ago, couldn't pass it up.
2 '39 mercedes 500k majahari editions. gullwing mercedes, and a few more, all 1/16 scale, at 64 i like the larger scales, much easier to work with.
I have 1/25-1/24 scales also
looking at building 2 at a time, one big scale and one large scale
retiring early next year, I will have lots of time(God willing) to get quite a few done, I might even try doing a YouTube channel.