I know I don't HAVE to buy it, but at this point, after 13 years in and thousands of dollars and at least two of everything (with one still MOC/MIB), it just seems foolish to quit now. My wife would love it if I did, but I can't bring myself to do it.
So for me the Clone Wars line will be a huge cost savings since I'll want to continue the two of everything, but I won't army build like I have done to a pretty extensive degree since ROTS.
Since I really like the Droid Factory concept, I might spend the money like I did with the TAC line and pick up three of every figure which will net me duplicates of all of the droids you can build.