question What do you think of twin domain names

[Boutique domains]

Guys, what do you think about the investment prospects of twin domain names? For example, domain names like photo. photo / link.link.
Welcome to share your thoughts
Thank you.

 

[Samer]

Only “twin” i’d own is the plural and singular of .com

 

[Grego85]

they seem to sell, but I don't really get why