Models too, 1-2 shoots/month, I'd say I UL 25 images/month. For the first time in my MS career I actually postprocessed 75 from a single shoot (so I went for quantity instead of quality), but it really was that kind of a shoot that you can do that (studio healthy lifestyle). I uploaded 2/3 of them so far, SS rejected 2 or 3, DT 1, the other sites accepted every single one. And I didn't UL them to IS, since the best match is still punishing indies and I'd just waste 75 photos. It really is a PITA to upload big batches to many sites sites, even if I don't do UL to IS. FT and DT and DP take way to long for the reason you already stated, SS takes 15 minutes or so (since there are always errors with keywords, but the editor is really great otherwise), 123RF and CS are a breeze, but they don't sell much, so I'm not sure I'll upload there anymore, at least not to CS. In times like this I wish SS would introduce exclusivity, since I'm really fed up of ULing to so many sites, it just takes so much time, although you have IPTC etc and it's supposed to be relatively automated. Well it's not, it's not even close.
I've seen so many small ports that perform great. I think it's more about the quality, then the quantity. There are many ports with less than 500 photos, that outperform those with 5k+. I really admire those togs and strive to get just a bit closer to what they do. I've also seen reports from ppl with 3-4k port not even earning 1k/month. I think such ports should earn at least 2k, if you upload regularly as you say. It's a waste of time if you produce like a madman and get some pocket money out of it. I mean stock photography is hard work, not a hobby you enjoy, so you should get payed accordingly