You're missing something.
First of all, dynamic crypto maps are usually associated with RA VPNs whereas normal crypto maps are associated with site-to-sites. That's not to say you can't have it the other way around, it just depends on the source of the connection.
At any rate, you can only have one crypto map applied to an interface at a time, but the crypto map supports many policy numbers. You can specify a different site-to-site with each policy number:
crypto map OUTSIDE 10 set peer x.x.x.x
crypto map OUTSIDE 20 set peer y.y.y.y
crypto map OUTSIDE 560 set peer w.w.w.w
And so on. In addition, a dynamic entry for a crypto map is usually placed as the last policy number (65535) and supports multiple dynamic clients.
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