I questioned GoDaddy people, and they assured me that my request for appraisal would not be public. Someone said that I would be investing 20K to 30K.
The problem is that you seem to trust appraisals which are
worthless. Sorry, but they are crap. Let's call a spade a spade.
How come people are so trusting just because GoDaddy tells you so ?

BTW, if they told you your names are worth no more than reg fee, would you order many other appraisals from them ? No way, they will tell you want you want to hear. They need customers that will register more domains.
Probably a lot at this point :red:
If I buy 2,000 names that cost $7.29 each, how does my initial investment get in the tens of the thousands.
You mean liability.
My plan B, if the names I buy do not sell, is to sit on them. I am not after the quick buck, but I feel certain that this is one of those times that this is possible.
Only a tiny percentage of existing domain names do sell at some point.
The vast majority are worthless to any person other than the owner.
The most reasonable is to assume that your domains will never sell, I actually recommend to only purchase you are prepared to develop, because most actually won't sell.
A bad name does not turn into a good name just because it has 'matured' for 10 years. It will just rest on your hands until you stop wasting money on renewal.
The domaining industry is full of people waiting for a big paycheck that will never materialize, because the supply is much higher than demand.
You need to think hard about how your portfolio will produce a revenue stream.
You said you want to team up with investors, they will want results, not losses. So what's your business plan ?
It's not about quantity but quality. If you have $20,000 to invest, pick 5 premium domains instead, not 2000.
The return will be better and you know you will they will be worth something.