[rapjr9]

If I was evaluating a free product I'd be wary of getting locked into it and then discovering missing features that I would have to pay for. That is essentially your business model, but even paying for a product I'd be wary of lock-in these days. Software can be complex enough that you don't discover missing parts or find the API is written in such a way that moving to a different platform is impossible without starting over, long after your business depends on it. So how does anyone know the product will remain free forever, is it open source? Can I fix problems on my own or will I have to pay you? Part of your marketing should be to show how those who try the free tier won't be locked in so when they grow they have a choice of buying from you, other vendors, or doing it themselves. Basically you are giving away a horse, but potential customers realize you have an ulterior motive and hence are going to be very wary of your gift horse.