Can you clarify the following:

Hive account@skatehype.com is the platform account with posting key of all Hive users: Used for post, comment and upvote.

Does this mean that users send you their keys, or are you getting them to grant posting authority to the Hive account@skatehype.com account so that it can sign operations on their behalf?

I see on your curation trail app that you are using Keychain to grant posting authority, so I assume that's what you mean by "account with posting key of all Hive users".

Pay new Hive accounts for onboard selected skaters and filmers (HBD 100,-/month).

Instead of paying for accounts with HBD, once you have enough Hive Power, you could setup a script that automatically claims account creation tokens with Resource Credits. Then you can create accounts for free with these tokens.