What do you think about unconventional physical investments such as Rolex watches, Hermes handbags, limited edition Nike Shoes and etc?

Nothing to invest in, too risky.

just an expensive hobby to own them.

Unconventional investments shouldn't be taken seriously. You can 'invest' in them (for fun haha) if you have the spare cash of course and let them appreciate as a rare item over time and at the same time, fuelling your luxurious goods collection hobby 😛.

I hear Rolex watches are great investments though due to their long production times. You have to wait years just for your one order to be completed!​​​