For example, a family limited partnership (or a family LLC) can be setup, where each member holds his/her membership interest through a Revocable Trust.

If it matters, I have the "Plus" membership.

Do they ask if you have a Costco membership?

I always tell 'em about the benefits of BP, and that's it's the most popular and respected real estate investment/membership site in the country.

I have tried a few other sites that offer this type of material but nothing in depth like this without a $100/month membership fee.

Broker/dealers, whether they are banked owned or are regular corporations they in addition to being registered with the SEC, must also ave membership with FINRA (formerly NASAD).

If I purchase the pro membership and pay annually, is that price locked forever?

Beware of the RICH Club, (I now recommend BP over most other groups) I was a member of the Rich Club for well over a decade, it once was a great organization, I was a person who used to get my membership for FREE by bringing new members & receiving RICH Bucks they called them.

Part of the membership in the local gun-club is getting to shoot a full-auto weapon on your birthday, and someone is shooting one every time I go there.

Actually, REALTOR associations are risk adverse so they rarely train or inform their membership they can actually serve their clients better through negotiating instead of mediating.