I don't like this thread. 
Your image selection is biased - the first three are intended to look like vintage guitar gear; I'm not fond of that vintage look, but I can already see where you're going with this. The first bass amp photo is of a god-awful Behringer combo, the second is of one of the leading brands when it comes to gear that's reliable but not necessarily attractive, and the third is actually pretty cool.
Let's try a modern amp comparison:
Marshall JCM800
Link Removed
Mesa-Boogie Dual Rectifier
Invalid Link Removed
Diezel VH4
Link Removed
Now, for a few contenders on the bass end:
Ampeg SVT-CL
GK 2001RB
[Invalid or Expired Link Removed]
Mesa Boogie Titan V12
Now, let's try a vintage-style amp comparison:
Vox AC30
Ampeg B-15R
Sorry, but I think the bass amps are equally cool-looking, if not more so in some cases.
And that's not even considering the basses - I think it's a known fact that while there are a LOT of "signature" guitar models out there - often variations on the classics - there are far more exotic custom basses, many of which have no aesthetic equals in the world of music.
Your image selection is biased - the first three are intended to look like vintage guitar gear; I'm not fond of that vintage look, but I can already see where you're going with this. The first bass amp photo is of a god-awful Behringer combo, the second is of one of the leading brands when it comes to gear that's reliable but not necessarily attractive, and the third is actually pretty cool.
Let's try a modern amp comparison:
Marshall JCM800
Link Removed
Mesa-Boogie Dual Rectifier
Invalid Link Removed
Diezel VH4
Link Removed
Now, for a few contenders on the bass end:
Ampeg SVT-CL
GK 2001RB
[Invalid or Expired Link Removed]
Mesa Boogie Titan V12
Now, let's try a vintage-style amp comparison:
Vox AC30
Ampeg B-15R
Sorry, but I think the bass amps are equally cool-looking, if not more so in some cases.
And that's not even considering the basses - I think it's a known fact that while there are a LOT of "signature" guitar models out there - often variations on the classics - there are far more exotic custom basses, many of which have no aesthetic equals in the world of music.

