Just limit the number of environments and keys that can be managed on each tier. 3 environments and 5 keys at the low end, 20 and 50 at the high end with a "cal

Just limit the number of environments and keys that can be managed on each tier. 3 environments and 5 keys at the low end, 20 and 50 at the high end with a "call us" option for super heavy use. Even if you can't rate limit in your current release it's in the license and when you can you move people up to a higher tier. This solves the issue of charging larger customers more without them getting more value. Unlimited number of users, files, etc should never be part of a public pricing tier. Fine for a negotiated agreement with an enterprise that has a definite period - it's a great thing to concede to close an enterprise deal and should be essentially costless. When it is in a public price list it makes larger sales much, much harder.