That's really interesting - any idea why that is? I really don't know - Besides florists not paying attention - cuz it's hard to believe 4000 of them are paying attention. How did/do they choose who to index?
Strange phenomenon indeed.
Too bad those 13,000 aren't asture enough to generate and upload a sitemap.
It's quite simple. When you sites that are essentially clones of one another, they get filtered. Google is about relevance - if you are a clone, you're not relevant. Google uses 250+ factors in their algorithm. Some of the more powerful factors are links, authority and trust. Domain age helps, too. The more aggregated authority, trust and page rank you have accumulated the deeper your site will be crawled. Those 4,000 sites have enough power to overcome the duplicate content filtering enough to be indexed - though most won't rank except for local queries.
Sitemaps are a crutch to get around proper site architecture. If your site is constructed properly, you won't need a sitemap. I'm not saying I don't use them ... I'm just saying that they won't solve a site's structural problems. You'll just wind up having some pages get crawled that won't get the authority they would have with a proper site setup. If your internal linking is borked you will have weak or isolated pages getting indexed and then dropped or relegated because they have no support.
Strippinrose - I agree with Cathy - you did a very nice job but somehow you have to lose that stuff at the bottom.
That's another Strider site ... although Strippin gave the wrong URL. It's www.aflowerbasket.com, also just launched. What you saw was Register.com's idea of a domain redirect. Classy, no? We'll be in touch with Tom & Ruth to see if we can help deal with the Register.com issue.
Ryan