are you sure their pollen sacs and not just swollen calyx, the calyx have the white hairs coming out of them that turn brown, the pollen sacs look like bananas are little flowers that open, round ball type things but they have a small stem that they grow off,
ive picked the sacs off before and the plants flowered without producing anymore, you can check if you have seeds by giving the calyx a gentle squeeze, if their hard then their is seeds inside, if their soft and squash then its seed free,
as for the amount of seeds its difficult to tell, a plant that self polinates may only produce 10 seeds across the whole plant, ive had plants that ive found just 1 seed inside so self polination produces a low number of seeds, but if it went hermie early in flower and produced lots of pollen then you could have hundreds of seeds,
now if it was male pollen on the other hand and the whole plant has turned to seed then you could have several hundred seeds, so its hard to tell without checking the plant, if the seed pods are hard then their is seeds inside, 1 per seed pod, each bud can have anything from 10 to 50 seeds depending on bud size as seeds will form inside the buds and you wont see these till you have dried the bud.
them pics on the other page are hard to say if its all seed or not, in the close up pics of the calyx give them a gentle squeeze, them close up pics are of the seed pods at the nodes, thats where the plant shows sex early in flower, so if these have seeds in then the pollen was in the room very early on in the grow, just give them a gentle poke, if theirs no seeds they will just squash,
but its ok to pull the pollen sacs off if you have got pollen sacs but if their open its pointless pulling them off, just spray them down with water when the lights go off and it will kill the pollen, or take the plants out the room so the light dont burn the leaves and buds then spray them down and let dry before putting back in the room, but at this stage if its got seeds then pulling the pollen sacs off wont make much difference,