Queries cannot be run in a template/skin, so if there are a lot of queries being run, it isn't because of a skin. Plugins/addons can add queries, sometimes many queries per page if they were not written correctly or efficiently.
As for upgrading them for your most recent version of vB, that can take some time depending on how customized the skin is. You will need to go through each edited template (they will be listed in red) and compare it to the default Jelsoft template and then upgrade the template.
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