Given the way one sets this up, I'd definitely say your target is developers. You can't use this if you are not technical.

More specifically though, your target is developers who are not familiar with seo, or developers who would like a quick solution for seo until they have time to address it in more detail later.

3.99 is a weird number for me. Just throws me off. I'd raise it to 4.99 or drop it to 1.99. Actually, just raise it to 4.99. If I'd pay 2, I'd pay 5.

Also, a case study would be a good idea, showing a specific example of how crawlspa has aided in indexing your single page site.

I really like the idea, have no use for it myself though.