we do not share your data with anyone and there are many ways to control the visibility and storage life of your data here.
but the internet is a public space and you should always assume your data could be compromised.
be smart with your password, use tor or a vpn, and use pgp for sensitive communications.
Yeah I've heard a few new vendors fall for that trap in the past. Start small and build up the reserve funds to keep stocked and allow for about a 3 week delay from sale to funds I think.