It is a one time notification to make it easy for people who want it - if you don't need the apps ignore them and you won't see them again.
You don't hear people complaining about this (even though they keep on sending all the time)
1 - why do I get an envelop with my paper statement - I always make online payments
2 - why do I get a popup from google to use something - I have never used them
3 - why do I get a renewal message for my magazines - if I want it I will call them
This pop up came in the middle of me downloading an application from the app store, it actually stopped my progress in getting the app for me to read the ad...it was an oddity that I had never experienced before, and it felt like SPAM for the following reasons:
- In the 8 or so years of owning an iPhone, I've never been prompted to "try out this app!" while shopping in the app store.
- Because it was something new, I attributed it to something new changed for iOS 9 (meaning, it felt like advertisements for Apple products within their own system)
- Because we have no historic record to say this is, in fact, an isolated thing and will only happen once (as you ASSUMED above), I made mention of it to see if other people were noticing it anywhere else, or with anymore frequency.
...this is a BETA. This is a time where strange, unique or unusual processes, actions and issues are discussed and brought up so they can be reported to Apple since the OS is being polished and readied for the end user. Telling someone to "ignore it and get over it" is just being silly...because this is not something that is normal to the typical iOS experience.
Could it be a one time thing and never pop up again? Absolutely. But it could also very easily be a new model of advertising from Apple within their stores...and if that is the case, I'm not a fan (like I said before), because I've had almost a decade of using the app store WITHOUT this kind of marketing, which is usually referred to as SPAM in all other parts of the industry.