Do your SEO techniques involve all that hidden text like on the sites you have for sale?
That is a very quick way to get the domains ignored/blacklisted by the 'big boys', thus unsaleable. It did work in 1995 (in fact up till about 2001), but not these days.
http://www.seo-glossary.com/hidden-text.html
Not a very good advertisement, nor is it a good sales pitch.
Just my 2c... take it or leave it.