Here's something that I don't get.

Is funnel analysis even suitable for a monthly subscription service? Unless you're mucking around with your checkout funnel constantly (why?) this seems more like the kind of tool that I'd use once. Or at least very, very infrequently.

Discover what's wrong, fix it, the end.

The weird thing is, psychologically I would have no problem paying a couple of hundred bucks for a one-off experiment if it shows me results that I can make clear decisions from. But I balk at the idea of subscribing for $XXX per month to do experiments over and over.

Perhaps KISSMetrics needs a one-time experiment pricing option?