Just because a domain has expired, doesn’t mean it has to be kicked to the curb immediately. It is worth considering turning the internet address into a parked domain for a certain period of time in order to generate advertising revenue. This allows domain owners to bide their time and come up with a new web project for the domain or to find a suitable buyer.
Many top-level domains, or TLDs, out there have the potential of being sold at top dollar rates. Gone are the days when domain names with ‘.COM’, ‘.ORG’ and ‘.NET’ were known as top-level domains. Newer domain names with ‘.US’ and ‘.IO’ are also worth their weight in gold. All you have to do is conduct thorough research in order to find all the good domain names you can park.

One of the best ways to obtain a valuable domain that is already search engine optimized is to purchase existing domains via auction sites.  This strategy can be beneficial mainly in two ways.  Firstly, any domain that has already been purchased was probably already researched for potential benefits.  Secondly and more importantly, the second benefit is that many recently expired domains still retain some of the search engine optimization attributes that were built up by the previous owner. For example, a recently expired domain name may still have active backlinks on the web, and the page rank of the domain could still be high, giving the purchaser instant SEO gratification with minimal effort.
While buying up a ton of domains seems like a great way to make some extra money, the real world results show that it is very hard to make that process profitable. As with any industry, you will have those "golden moments" when someone you read about made it into a million dollar a year business, all while sitting in the comfort of his own home. That could be true, but he probably consumed a lot of alcohol and lost a lot of hair doing it.

I OWNED DOMPERIGNON.ORG, incredible, but true.  Lost it, back in the days when internet in India was not a readily accessible utility. And I was a casual domainer.  You had to go to a cybercafe. Did that late in the day, towards the expiry of the domain. No chance of renewal. The domain is now with the owners of Dom Perignon and is redirected to domperignon.com! 
I have some pot related ones I've purchased recently that deal with the manufacturing of hemp like hempmfr.com, hempmoulding.com, hemp-textiles.com, hempecofuel.com etc.  Some of the older domains I've been sitting on are ones like internetpot.com, califunk.com, cafunk.com, caedibles.com, 1tokewonder.com, govherb.com, grasspeddlers.com, pot-megastore.com, usgov420.com etc.  Another interesting recent on I've purchased is Dogparkdates.com and dogpark-dating.com. Do any of these seem valuable in your eyes?
The dropdate for the following TLDs is not verified. Domains might drop earlier or later: .eu .cat .aero .travel .tel .jobs .ae .at .be .bg .cr .es .fm .gd .gg .gi .gl .gs .gy .hn .ht .hu .id .im .ir .is .je .ke .kg .ky .kz .la .lu .lv .ma .mu .ng .no .om .pe .pf .pm .qa .re .ro .ru .rw .sb .sm .sn .so .st .su .sx .tc .tf .th .tl .to .ug .uy .uz .wf .yt .berlin
I’m ready to purchase domain hunter gatherer after seeing your video but I’m a little scared to spend money because all I need is information for South Africa and the Domains that expire for .co.za if you can do a quick check (not a long as the video ) on the features it has for .co.za and let me know id show my appreciation by purchasing immediately as this is my only concern.
Many non-savvy internet users may not even be aware of the existence of other extensions. That said, because there are many new extensions popping up every now and then, you can often find amazing one word and 3-letter domain names with these new extensions that are otherwise almost impossible to find unregistered in the .com world. Additionally, these new extensions are becoming more and more familiar to users every day, hence it's almost certain that their value will continue to increase as time passes and wider adoption manifests.