Here's the basic points I hoped to make in the reddit post:
An unscrupulous developer can do the following to a) inflate his own ratings and b) destroy the ratings of competition. This is happening to me right now. This is the process:
1. Buy app.
2. Rate app.
3. Sign into another Google account.
4. Repeat steps 2 and 3 as many times as you have fake accounts.
5. (Optional) request a refund within 15 minutes. The ratings stay even though a refund was issued.
I made a public Google Plus post about the issue and hopefully it can get in front of some Google higher-ups eyes. Please +1 if you think the issue deserves some of Google's attention:
Google Plus Post - +1 if you think these 2 issues deserve attention