Unless you are in an extremely busy lab ($800+ revenue per day) you're going to be asked to do other things around the store, such as resets, facing, unloading the truck, etc. Can get tiring running back and forth between the lab and whatever other task you're asked to work on.
Asked to push items that nobody wants (photo coat rack, anyone?) and get paid lame commissions ($1 on a $30 item). Commissions used to be much better in the past - in 2007, I was getting an extra .50 for every 5x7 or 8x10 print. Added up real quick. This was probably removed since most of these commissions were received without having to really make an effort to upsell.
HPSes should really make more money, given the level of training and expertise needed to do the job well. Some HPSes don't do crap, but don't penalize the rest of us for that.
Rumors of photo being phased out have been rampant for years - it looks like the farthest it's gone so far is removing film processors from new stores, and switching to dry printers (more efficient for low-volume stores). I would not be surprised if this department were automated in 10 years and eliminated in 15.
There once existed a District Photo Supervisor position. A couple years ago, this was condensed to an Area Photo Supervisor, and then eliminated entirely a year ago. You have hit the top of the photo career track at HPS. You will have to jump onto the management track (you would generally move to STL, which pays nearly the same with a lot more responsibility)
The STL position is a crock in itself, and seems to be a way for Walgreens to cut management pay without firing anyone (eliminating MGT positions through attrition).