That's true. On the other hand, pages with infoboxes are likely well-linked and will end up in the cache either due to legitimate popularity or due to crawler visits.
Checking a random sample of 50 pages from this guy's dataset, 70% of them were cached.
Note - there's several levels of caching at wikipedia. Even if those pages aren't in cdn (varnish) cache, they may be in parser cache (an application level cache of most of the page).
This amount of activity really isn't something to worry about, especially when taking the fast path of logged out user viewing a likely to be cached page.
Checking a random sample of 50 pages from this guy's dataset, 70% of them were cached.