It's as it should be: http://marketingland.com/why-im-glad-google-play-gives-devel...
Giving developers the option of contacting users regarding issues is alright ... giving every developer of every app I installed my private phone number is NOT (in my personal opinion).
How about:
- the download failed, did I actually purchase it?
- has my refund been processed (note that the current setup lets developers have refund policies that are more generous than the Play Store's 15 minutes)?
- did transferring my purchase from another app store work (which often comes up if a developer leaves the other store)?
- why isn't my in-app upgrade working (could be a code bug, could be a processing bug on the in-app purchase, etc.)?
- ...
That's... that's not what it is. It's every app you've PAID for. I would argue that giving people you've given money to direct access to be able to fix issues for you if they come up is a benefit.