After seeing Chamaileon drop their free tier earlier this year for charges that begin at $150/mo, your pricing model is a breath of sanity. Cheers to your success!
In fact, it's more likely that we double-down on free access going forward: the revenue comes (and will continue to come) from those that need more. When you need "more", you're typically willing & happy to pay for it. Pretty much as simple as that :-)