As an example, someone could buy 100 available arbitary letter number .com mixture and, if lucky, cover their costs, and or possibly make a 100% profit in, say 1 year.
Not a very good rate of return by domain standards.
To buy 100 available arbitary letter number .orgs or .nets, the chances of even recovering the investment in a year or two is very remote.
I think the money tied up for all that time (1,2,3,4 or however many years) can be better invested in other sorts of domains.
Many of us have seen the argument that 4 letter .coms are rare and therefore have an inherent value, and experience shows this is false.
I think the same happened for three letter mixed letter number .coms and this is also pretty much false.
If you take the value of .orgs and .nets as 10% to 40% of the .com value, then this would be pretty clearly a poor investment of money.
How many profit making companies (or high profile non-profits) use 3 character mixed letter combination .nets or .orgs? I think the answer must be very few when compared to non-mixed domains.
I have had some luck with mixed number letter.coms, but these were very carefully selected and I always had to pay some sort of a premium in order to acquire them. They weren't available domains.
Have we convinced you yet that there is no value in these names unless they have some special characteristc (e.g. name of product, company etc) and that there is unlikely to be in the near future?