Sure! I can offer one reason that isn't purely "because we got a discount".
Imagine that you're a company not necessarily known for security prowess. Now imagine that you want to be able to demonstrate to users / customers / investors that you take security seriously and work with reputable vendors. You could list off the vendors you use, but then they're just taking your word for it. Wouldn't it be better if the vendor listed you?
Alternately, perhaps there are common investors or board members exerting influence.
Imagine that you're a company not necessarily known for security prowess. Now imagine that you want to be able to demonstrate to users / customers / investors that you take security seriously and work with reputable vendors. You could list off the vendors you use, but then they're just taking your word for it. Wouldn't it be better if the vendor listed you?
Alternately, perhaps there are common investors or board members exerting influence.