i am not to sure exactly when this happened but i think it happened when i found around 1000. but they show up as red dots on your compass maps. this is very helpful once you start getting thin on the spiders. dont confuse this with enemies.
Thats the point though. Why bother? It doesn't really give you anything but some achievement points, and they're EVERYWHERE. It's like hunting for easter eggs and you cant take a step without walking on 3 eggs. I'm sorry, but in a game this size, collectables should stick to the 100-200 range. That way if you're missing some you have an easier chance of knowing where to get them. Over 2000 is just insane. This, and all the optional quests, are nothing but time wasters to make the game seem much longer than it is. Like I said in my review, if it unlocks things like costumes, special missions, alternate characters, etc etc, then I wouldn't be as against it, but in the end they're not worth picking up and due to the sheer number of them, they may as well just not have added them in at all.
It's a waste of time if you can beat the game with ease and only have found about 400 of them. I beat every boss pretty much straight away, to include the final Venom fight, without dying. So, yeah, it seems unnecessary. Plus, if there are only 100-200 it's easier for people to collaborate and write up where they all are so you can find them easier. So for those collector junkies, if you can't find a few of them, you go online and look and see which you're missing. Also, the others ended up unlocking things for you, so it was worth collecting. The only thing you unlock by collecting these are achievement points, and even then it's not really worth it. I'd rather have 100 really well hidden pieces to find than 2000+ really easy ones because lets face it...when you get down to that last 200, it's going to be a pain in the ass to find them just as well.
Like I said. If you're going to call them collection pieces, don't make them integral as much to expanding your character, and do like every other game and make them unlock something. Health and speed are nice but still, being able to beat the game with so little and do it easily shows it's lack of worth. I think the game failed badly with this.