Just a word of caution. Please don’t register thousands of alternate extension domain names because of some promo if they would not be considered top shelf under .com. Waste of resources all around. I know that .co for example is seeing a temporary surge of interest. I was there for the general availability in 2010. Still have a few. That is when the new registration opportunity existed. I have also several times bulk registered nGTLD:s I believed in. .online .tech. All at launch. They don’t sell well. It’s a mirage.