Getting into the inbox with Sparkpost
"One thing that puts us off a dedicated IP is the extra admin that would be involved in keeping the IP off blacklists. "


That's one of Sparkpost's responsibilities (although you should also monitor, just in case, I particularly like http://multirbl.valli.org/lookup/).


  "If you are on a dedicated IP, how many emails per month are you sending? Has monitoring your dedicated IP for blacklisting been an issue?"


We send around 200k emails per month from ~ 25 domains, all on the same IP. We haven't had issues being blacklisted, but some clients have had issues with their domain appearing on some blacklists, especially if it was their first mailing (with invalid addresses).