Redundancy, disaster recovery and planning for failure - how much do you pay attention these terms in your attempts to squeeze out every ounce of cost from the project? If not much, do so at your peril.
While we ALWAYS try to analyze all possible failure points and resulting consequences with our customers we are always so very surprised when cusotmers seem to have almost no interest in doing the same (or paying for an adequate solution addressing these). Why? No idea, especially considering that it's their business we are looking out for.
Let's take menu boards for example. You would think these are pretty mission critical items, right?
When our sales guys come begging to me to remove $900 or so dollars it costs to add a second player to a dual menu-board configuration promising to close a major deal, our tech desk strongly opposes.
We don't do menus with a single player. It's just not bulletproof.
Consider what happens if one of the players or screens die, for whatever reason: dust, heat, vandalism, whatever. You have no menus!
Even the best of SLA's is not sufficient to get you back up and running in an acceptable time... How much money have you lost in the process? How much confusion would this cause with your customers? I bet it will exceed the money you saved by running an extended desktop, single license/player set-up with no failure plan.
In a dual menu set-up, we always recommend an emergency playlist that combines all essential elements of the menu on a single display. If one player/display fails, the back-up menu playlist can be urgently deployed while the issue is resolved. Total downtime is minutes, not hours or days.
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In process of trying out new business models, we recently started offering rental options for the wearable digital tags we typically re-sell only. 
Strolling through the ACC before Tuesday's game we snapped a few photos of the Ford Exhibits. What struck us as interesting was that less than one week prior, these displays displayed an entirely different set of cars. If the display used conventional signage and vinyl graphics, there would have been considerable work involved to switch the displayed vehicle and rebrand the display. By using digital to deliver model-specific information to the audience, it was considerably easier to switch the exhibit around for a new car. 
When working with the latest client on an in-window street-facing installation we received much resistance attempting to justify use of commercial LCD's. ...until we took the store manager for a brisk walk on Yonge street. Attached picture was shot on an overcast day, in a relatively shaded window outside the Eaton Centre. Even under these 'optimal daytime conditions' the screens are barely noticeable. (NOTE: We even had to re-upload the picture emphasizing the screens in the picture....)
I'm a traditional print business, but I want a chunk of this new
digital signage market. What do i do? I invent a WAFFiL! What's a
WAFFiL? It's a Wireless Ad Frames For Interactive Loyalty. 
Are you using weather and news content on your digital signage? Do you know where this info comes from and is it licensed? Apparently that may or may not matter... Confused?
Planning a video wall in your store? Consider the following musings. An average 3×3 video wall requires a minimum of $20-25K hardware investment (assuming costs of premium-priced thin-bezel displays). Installation costs are high as well. Let's peg the total at a moderate $30,0000. Where is content cost in all this? Often completely ignored.