IMO, it comes down to the basic human needs. 1. Health - Without it, you can't do much 2. Dating - The need for romance/sex/relationships 3. Finance - To ensur

IMO, it comes down to the basic human needs. 1. Health - Without it, you can't do much 2. Dating - The need for romance/sex/relationships 3. Finance - To ensure food/water, housing, savings