All correct.
I did post quite a lenghty reply in another thread.
You must have an intended market and understand what the public will remember.
If you wish to test this theory, pick 9 friends and family (different ages). Tell them verbally one of the domain names each but only once (key because once should be enough for a good solid domain), give it a week and ask them what the domain was you told them. The trick here is also not to tell them how to spell it.
Let us know your results.
It's all about keywords, relationships between words and extensions and the domino effect.
All of your above domains may have very small potential if (big word) a developer came along who checked through a list of 10000 they wanted and all were taken. Even then they would be very reluctant because their time and money would be spent in advertising and promotion which is even harder with obsure domains.
The conclusion... their offer being the reg fee at most. And if the offer came 3 years after, you would have lost 2 years reg fee, therefore making a loss.
Save your money, research and look into purchasing dropping/expired domains. Domains can be like whisky/brandy/wine...aged over time can become more sort after if they meet specific requirements there will be more potential buyers. But it's all about the keyword(s)!
Each time you handreg a new domain ask yourself "if it's available is it worth anything?" then research.
Hope this helps and good luck.