Vault's client-based pricing was (is) the worst thing about selling it. When I was there, nobody in sales liked it except the SEs and account reps dealing with the largest customers (and those customers loved it because it actually saved them a substantial amount of money over other vendors' models like per-use or per-secret). All the customers except those very largest ones hated it. The repeated response from those who believed in the client-based pricing model, to those of us pointing out the issues with it, was essentially "if your customers don't like it, they must not understand it because you aren't doing a good enough job explaining it".

What I thought we really needed was a "starter/enterprise" dual-model pricing structure, so that smaller customers could get pricing in some unit they could understand and budget for, that would naturally and predictably grow as they grew, to a point where it would actually be beneficial to them to switch to client-based pricing -- but there seemed to be a general reluctance to have anything but a single pricing model for any of our products.