Using symlinks / multisite to display one drupal site at two domains
I don't think it's going to cause any problems, but it seems you just make things complicated for no reason. So, that would be a reason not do it that way :)

Just point both domaines to ~/sweet-bro/html and get rid of the symlink in /sites/.

Both domains will be showing the same site, as long as you don't use a .htaccess rule to redirect to one or the other.