Why Are Gold Solidus with some exceptions far cheaper than the Gold Aureus

[Phillipe C]

I have been collecting for 13 years since I was 19 and have a modest collection of about 300 Roman Coins mostly Silver. I also have a small Collection of Solidi and am curious why they are mostly far cheaper than Gold Aurei. For example the only Aureus I currently have is of Trajan Decius I had to pay $6000 for it and its actually very light about 3.45 Grams. My Solidi weigh more yet cost far less why this price difference.

Thanks for your answers guys.

[Molinari]

My guess is mostly aesthetic reasons but also rarity.

[Jay GT4]

Also a name carries a premium.  People want the big Emperors like Augustus, Tiberius, Nero and Trajan and those big name Emperors minted aurei.  There also seems to be a lot more solidii out on the market at any given time.

[SC]

Far fewer aurei survived than solidi.  They simply had more time to be recycled into new coinage than the later solidi did.

Shawn