Hi there.....i was just wondering how can you have a spider 10 cm+ but you want to sell it as unsexed.......are these guys trying to make money or do thay just not know anything about the hobby?? hope i am not stepping on some toes now....

In one scenario it can sometimes happens when breeders have a lot of stock and they eventually grow quite large. Instead of taking time and sexing them and selling males for less and females for more, there is a middle price, to make things easier and safer. Sometimes the exuviums will be damaged and the owner will be unable to sex, and owners (sometimes me) won't really be bothered by the sex until they mature since that's what you are waiting for but then decide to sell them before maturity. I'm sure there are a lot of other reasons but those are the ones that I just thought of. You must remember also that breeders have a few 100 spiders, sometimes it's not possible to sex all of them.

I have a few spiders that are unsexed, including a few 10cm+ H.gigas.
They are in arboreal containers filled with peat, so when they moult it is impossible to retrieve the moults without destroying the whole enclosure. They also dont usually throw the exuviums out, but instead shred them.
For some or other reason I have also found thet P.formosa love destroying their moults, so have probably gotten 1 sexable moult from a formosa out of maybe 30 over the years.

And I often get busy for a few days and don't notice spiders moulting (And I dont have such a big collction compared to some members on here), so often get to the moults to late to sex them.

@spiderpilot ,I do don't know if you are referring to me add I recently placed on junkmail with a nhandu chromatus (brazilian red and white) and lasiodora parahybana (salmon pink),the spiders where 10cm + and labeled as 'unsexed'.well if you are then I only placed them as 'unsexed' as I don not have much experience with sexing TS so I would rather not sell my juvenile or sub adult spiders as 'sexed' just now they end up being the opposite of what they where sold for .and I'm not a person who doesn't know anything about this hobby ,I'm just not good at sexing Ts.

I didn't mean this to come out the wrong way but was just putting things clear.

Any sub adult spider that has not been sexed by inspecting the exuvium is UNSEXED in my opinion.

This must be done by someone who knows what he/she is doing, specially with smaller exuviae. With adult spiders, and more so in males, an experienced keeper can with some degree of accuracy, visually identify males and females based on physical characteristics for example body shape, body patterns and/or behavior. Some males develop tibial apophysis/spurs/hooks, others change in appearance (sexual dimorphism), yet others may just look a lot more slender and skinny when compared to females of the same species. In females, clues like body patterns, a more bulky appearance and/or the lack of the above male characteristics might guide an experienced eye. A spider sitting on an egg case would normally be female.

Any spider can be sexed accurately when submitting it to DNA testing, but this is not an option for most people because of logistics and cost.

Accurately sexing spiderlings and juveniles remains a dodgy business, so it would not be uncommon for honest and experienced keepers to sell a spider as unsexed.

The opposite may also be true. An experienced keeper might know the sex, but an "unsexed" spider fetches a better price than a male would...

Judging from the replies, seems there are valid reasons for having an unsexed 10cm+ specimen. But you will also get the scaly types that will take advantage of people when they can.

I remember seeing a large P irminia in a shop, it was unsexed and going for quite a lot. I spoke to Scarab who told me to just look for hooks (I just started out, so was not aware of details like that at the time) and low and behold, it was a mature male.
So either the shop is not knowledgeable enough and got duped by the person selling them the spider, or they are hoping to dupe a buyer by selling an "unsexed" mature male to an uninformed person.

But also keep in mind that some people don't mind the sex of the spider either way, so they might be getting a female for cheaper if it is unsexed or paying more for a male that they can breed with and get lots of slings. Win win