I think you may find that fewer and more targeted landing pages may work better than the "Shotgun" approach.
It's 2K but unless you really know what you're doing I'd advise against just dumping 2K keywords into one ad group.
I advise the number of keywords is not really important but the relation among each keywords are important.
2k keywords is an awful lot. Don't gauge your PPC campaign on amount of clicks you can get but Conversions on the website. Set up Google analytics to help you decide if your getting a good ROI
As previous people have said 2K but I would say about 200max and I would guess that only about 50 are regularly used.
He means if the keywords are almost identical to each other then you should be ok. Like Make money make money now make money quick i are ok, since they're most likely similar. but Make money Get rich work at home will not work. That's the point I think.