I'm going to look deeper into supporting homebrew , dpkg, rpm, etc in my projects. It's a royal pain for me, but it's much more convenient and secure for people already using these systems. Also it does appear that people feel more comfortable downloading a binary (I can add hash sums on the website if people bother to verify).
Thanks for the feedback. I'll see if I can move away from curl-pipe-bash. It was the winner in the poll, but the comments showed I was missing some much better alternatives.