Well, stack an address with certain amount of bitcoin will not be an easy target for hackers, we could check and see how much bitcoin store in an address in blockchain at anytime, doesn't mean it will be hacked. There are few members here who have forgot their wallet passwords, but no one could cracked their wallet even for free % of bitcoin, which mean a bitcoin wallet is safe.
Even though I'm not interested to show off as well, but people could do whatever they want, in case of Op want to join or create a club of bitcoin holders, it will be fine as long as "the members" stay in anonymity.