I wasn't commenting on your practice, I was trying to save the time of those visiting the thread to know the "beta" costs $10. You ought to edit your original post to clarify that. But since you referenced a blog post talking about your position...
The post in question says:
Giving Away the Plugin for Free
This is important: don’t give away your plugin for free, even in the beta phase. You only want people who will pay for value.
You can give them a steep discount, and make it known that’s a huge benefit.
People who pay to test are more likely to give you regular feedback, since they have their money on the line too. If you need further convincing on why you should charge beta testers, read this.
That bit link to another article, which claims:
Why do I charge for beta tests?
Because I’m looking for the type of people who will pay for value — these are the same types of people who will pay for the product when it launches at full price. If I opened it up to anyone for free testing, I’d get 100x the response rate, but the type of tester would be totally different than the real customers. In other words, people who pay are far more likely to actually open, use, and give feedback on a beta test. I have statistics to back this up by unimaginably huge margins, which I’ll share later.
Emphasis mine. That data is not shared.
Please share the data. Without the data, it isn't science, it is just marketing.
That isn't a reply, it is a deferral.
I've run and participated in beta programs for decades, and I am pointing out that the topic of this thread and your approach is inappropriate. It should say something more along the lines of, "Half-off my new plugin for beta testers", because in lieu of stricter rules, at the very least this forum should make an efficient use of folks' time.
That is my feedback to your original post and follow-up. I am not going to reply anymore, because my point is clearly stated.