I just don't omega every character or every ability. Right now I still have a few omegas left since I went in and put ones on abilities that may be useful. But I only put them on characters that will likely return the investment. I did get chewie at 7 stars. I got all his omegas and one of his zetas already but still waiting on gear to get full use out of him. Though he is useful at g9.
I didn't have to choose between him and jango because I'm not a whale and still have jango at 3 stars. No point in using omegas on 3 star characters that aren't even able to be used in the raids.
So the crunch is much less if you only omega or zeta characters that improve either arena rank or raid performance. Tb and tw performance will follow since good raid teams work well in tw and tb also.