I tend to agree with the prior posters on most of their points. (Lois - you're right about the Europeans - but there are a few of us here in the states who also value this info ...). Here's one 'hypothetical' progression that a new CP owner might make ....
Once you start growing Sarrs, it's likely, at some point, that you'll want to have a representative from each species (there's not that many species & you've noticed that some are really different (ie: psit) and some are pretty similar (flava & oreo)). Once you have one from each species, you find that there are some significant variations within species (like S. flava var atropurpurea, cuprea, rubricorpora, maxima (silly name), rugelii) - so now you probably want a plant which represents each 'significant' variety within some (maybe all?) species.
By now, you have quite the collection. It has taken some time, effort & possibly money to get this collection & along the way - you've spent some time studying these plants. While studying the plants, maybe you notice that your one variety of S. flava var atropurpurea (all red flava) develops with a deep red lid and a weaker red on the tube when it emerges and another does just the opposite (deep red on the tube and the lid darkens a bit later). So now, you're curious. You've noticed something that you haven't seen discussed anywhere or noticed in pics (of course not in pics - people will only show pics after the red is really deep on both plants). In your studying, you notice that the location for one plant is in Florida but you don't have any location info for the other. However, the other plants that start their development with a red lid (var cuprea) in your collection are from North Carolina. Hmmm... Knowing this little tidbit allows you to extrapolate that the plant with the lid that darkens later
may be an extension of the var rubricorpora (red-tube) population around Appalachicola and your other plant may be from a North Carolina population*. Either way, you start to realize that having location info (that you may have previously considered silly or overly meticulous) was potentially good info to have.
In addition, by now, you've been trading & interacting with other CP hobbiest for a while & you've noticed that some of the folks with the larger collections place a priority on location info - sometimes - so much so - that they don't even want a plant unless it has this info... aka: if you don't have the location info, they don't want to trade & if you do, you can often get more for a plant that has the info (ie: the 'CP currency' is greater).
As the others have noted, it's really a matter of choice or preference. For me, as I've collected plants, I've found that the more information I have on the plants (location, previous owners, specific seed clone**, sex ***, etc), the more valuable they are to me and potentially to others. Getting this info at the beginning of a trade is frequently quite simple - while tracking it down later is often impossible (try getting info from Chuck Lyons about that petio you bought 2 years ago or on that Nep from Henning von Schmeling). On other aspects of the hobby - we all have different preferences (ie: Swords w/ the cool / weird succulents) and sometimes these preferences change with time. Why am I now interested in the Iperua Utrics when I've had no interest in them previously?
Interesting stuff ....
* - this little story is roughly analogous to discoveries with my 2 S. flava plants (codes 43 & 46 - pics on my growlist)
** - in Sarrs, at least one study has shown reduced growth from selfed plants. In other species (like the Drosera petiolaris complex) - 2 different seed clones are required to even produce viable seed.
*** - Nepenthes are
dioecious plants. A N. hamata recently sold for
$735 on ebay. Given the dearth of females for this species & it's tremendous popularity - knowing that your plant was a female would likely enhance the value a bit .... (or a bit more than a bit)...