Many people like to take pictures of buses and post pictures
here. However some services seems to be neglected and not much or
no pictures are even posted here.
Which is the bus service here that has the least pictures taken
by bus fans? 
I noticed for SBS Transit,
they are 2, 9, 11, 91, 96, 101, 166, 191,etc.
This comes down to the notion that a handful of people do not stand
at a road intersection to photograph the full perm fleet of a
service and upload here. Even if they do its kept in their
repository.
For those who snap and post here, its an 85% chance that the bus
they snapped is a cameo. I can list down the services that are
seldom photographed and posted here but I shall just use your
list.
2 - Mk4s occur rarely since the B9s came into service but B10Ms
dont really entice the bus fans here. VSO occur as rarely as the
Mk4s but the bus fans are more enticed by this.
9 - Only a B9 or a K230 picture will this service gets its
attention here. So far if there's a VSO on the service it will
makes its way here - which is also quite rare. In addition some
people are not enticed by VSOs because they were once perm on the
service.
11 - There was some hype when the Mk2s around due to the
different varients it had. Only a K230 on this service then a
picture will be posted here. Mk4s are not enticing as well.
91 - Maybe a Mk3/K230 appearance will get someone snapping, or
even a B9 doing the 74/91 xover. Now that's epic.
96 - It has all the single deck models perm on the service. What
more can you ask for? :) Even a K230 and 2837R cameoed on 96
before.
101 - Same as 96 minus the K230 portion, which means only a K230
appearance will get it posted here
166 - VSO pictures are likely to grace the picture thread here,
which is quite rare in current time. and again the Mk4s are left
out :(
191 - GOT LOR! only when 2837R does the service. Other than that
I think zero.
Which brings me to a point that the Mk4s seem to be neglected
here in general. Only the amdep and slbp Mk4s are more in the
limelight than the rest. Sad :(
I'm speaking in a general perspective of the trend here and has
no intention of pinpointing anyone in particular.
