yea, I figured it probably doesn't work out for all. Though, most "inbox CRM" people I've talked to have scaled well past 200 customers (including us). What is the biggest pain that a specialized CRM solves for you?
In general, I'd say support bandwidth is dedicated more to a "moving window" of how many new customers you have, rather than total customer base. Most customers tend to be pretty low-touch after the first month, where they get most of their questions answered.
(btw, just posted a more detailed reply to your comment on the article itself)