At the end of the day it comes down to do you have some plan for what you are doing with all these domains. I know I ask myself that constantly. I made sure to get .tv under 40 domains next goal is 20, I do not want more than 20, now I am just speaking for me not telling anyone else what they should be doing. I no longer get caught up in what I call "Domainer Trap"
You start out with a plan, a niche, you know what you know and what you don't know. Then you start reading and there is hype behind one genre of domain, this is a genre you know nothing about, and had no interest in. But you are only going to spend a few $ no prob. Two weeks later there is a buyout coming on a niche and you buy some, only a few $ so no prob. Now you are reading DN Journal and you see 6 I****.com sold for $1000 to $5000 WOW are I names good ? maybe I should spend 7 hours searching for available. Found some I names only spent a few $$$ no prob. Wow those GEO .tvs are selling maybe eastboise.tv is worth a reg. Ok now there is a new tld coming and there is a decent thread about the ext maybe I buy a few. Now a year has gone by. Why did I buy those blook domains, what the f is a KNOL, how about logonyms, is there even a place called East Boise ? Now a lot of money down the drain and nothing done on the whole reason why I started regging domains in the first place. But I keep reading sales threads and DN Journal weekly sales report. Rinse and repeat, another year goes by what happened to my great idea ? Oh I have no money for advertising and to market the idea now because I spent it on domains I had no interest in when I first started. No matter who you are, no matter how wealthy, there are only 168 hours in a week. Sleeping,eating,family/friends you are kidding yourself if you think you are developing 20 ideas. Again IMO