Am I sending too many emails??

Last week, I launched my first Kickstarter campaign and simultaneously revealed the cover of Book II in a series I’ve been working on.

Usually, I send emails once a month, but in the lead-up to launching the Kickstarter, I sent emails a little more frequently. (Once to twice per week)

In some ways, I have seen that this is worth while as I’ve been getting good results for my Kickstarter.

But on the other hand, I lose subscribers with every campaign I send. One person who unsubscribed last week gave the reason that “Emails are too frequent.”

What would be best? Should I send fewer emails during the Kickstarter month and risk getting fewer backers, or should I just not worry too much about people unsubscribing? (I currently have an email list of about 500)