I think for most of us, it is typically apparent what accounts look suspect, but there is always that small chance it's a new user genuinely looking to enter the crypto world. Basically not an easy problem to solve, looking forward to any enforceable solutions.
I personally don't care if someone has more coins than me. I don't want to waste my time and risk money, but if somebody has a lot of time and money to create sockpuppets I'm ok with it. The only important thing for me is coin price. I don't see how it could hurt the coin if someone has 10-20 stakes. I read that there were only a few investors in Nxt, 20-70 people, nobody knows for sure. But they didn't dump coins and Nxt succeed, so probably it's for the best if the coin doens't have too many holders.
I was thinking to invest in Reddcoin but decided not to because they're sending 1% coins to investors every day and I was right. While investors were waiting for their money guys with mining power mined hundreds of millions coins and dumped them, so the price is aroud zero now.