Some tips:

1. Don't post with your real name. Then NO body wil know who you are.
2. Fences and guards never stoped someone extorting anyone. Extortion happens like you said with images of the kids or wife. A fence can't stop those.
3. A security guard is nice but when you have millions the thieves and criminals don't come alone. This aint a movie where steven segal powns the intruders. One bullet is enough.

The only real way to not show what you have:

1. Take your money of your steem account into a bittrex account and no one wil know what you have?
2. Or vote for a hidden away system of savings.

I believe some of the beauty of steem is that you can see what someone has on there balance. What there voting power is, and who you are dealing with. If you hide the balances of people but not the voting power what is the logic behind it then?

If i vote up someone for 3.5$ they know i have a balance of 15.000 (in your system they would think i have) but in essence it can be delegated.

This idea is not thought threw enough in my opinion.