From my experience and what I have seen, some companies publish updates as soon as they have something new, while others aggregate updates over a week or a month. This usually depends strongly on your speed to ship, implement, or deploy new features.
To answer your question, yes, it reactivates old users. That's why more and more companies are maintaining a changelog and sharing product updates. Numbers really depend on the field you are in but, most importantly, on the content you send. There is no magic; if the content does not match users' interests, you will have wasted money sending an email. However, usually, the benefits far outweigh the disadvantages.
The more you ship, the more often you can send product updates, and the more likely you will catch user interest. However, the trade-off is that users may consider your content as spam, especially if you send updates too frequently. Again, that's a trade-off, but if you play the game seriously, it pays off over time.
Regarding pricing, it does not have to be expensive. For example, with Noticeable, native email sending is supported starting with the Starter plan at $29/month. Sending 500 emails would cost an additional $2.50. In contrast, sending 23,000 emails would add $36.
Besides, note there are many channels to share product updates. Emails are a great way to reactivate users, as you mentioned. Automatic push notifications on social media are also a good option. To reduce churn, in-app notifications through widgets are also an option. Some services like Noticeable support pushing product updates to multiple channels with one click.
Years ago, I created
#noticeable (noticeable.io) to help with this.
From my experience and what I have seen, some companies publish updates as soon as they have something new, while others aggregate updates over a week or a month. This usually depends strongly on your speed to ship, implement, or deploy new features.
To answer your question, yes, it reactivates old users. That's why more and more companies are maintaining a changelog and sharing product updates. Numbers really depend on the field you are in but, most importantly, on the content you send. There is no magic; if the content does not match users' interests, you will have wasted money sending an email. However, usually, the benefits far outweigh the disadvantages.
The more you ship, the more often you can send product updates, and the more likely you will catch user interest. However, the trade-off is that users may consider your content as spam, especially if you send updates too frequently. Again, that's a trade-off, but if you play the game seriously, it pays off over time.
Regarding pricing, it does not have to be expensive. For example, with Noticeable, native email sending is supported starting with the Starter plan at $29/month. Sending 500 emails would cost an additional $2.50. In contrast, sending 23,000 emails would add $36.
Besides, note there are many channels to share product updates. Emails are a great way to reactivate users, as you mentioned. Automatic push notifications on social media are also a good option. To reduce churn, in-app notifications through widgets are also an option. Some services like Noticeable support pushing product updates to multiple channels with one click.