What you have invested has got nothing to do with the sale value. It only colours your judgement. I have a name barn-owls.com that I registered in 2001 to use on Ebay. I've renewed it every year since then. Does that mean that it is worth more than NewCoinWeek.com which cost me $6.69 a few days ago - I think not.
Why did you register the names for more than a year?
The bottom line - You probably aren't going to sell any of the names unless you do some marketing. Going out and buying more doesn't teach you anything. Spend a month or two rading up on domain name selling, and see what you can do. Hopefully you will have some success, and you can come back and show us we were wrong.
Remember, to sell a name, a buyer has to be able to contact you and make an offer, you need to be able to respond, and if a price is agreed, then you need to have a payment method. At the moment, it doesn't look as if you have much of that set up.