That's where you and I differ: I never do the relog dance...it is simply not worth it to me. The process of going through all six of my characters takes me about 15 minutes:
- collect sales and expired item from mail
- post (new and expired) crafted items to GTN
- check my listings to see what I am missing
- check GTN for deals on materials
- start crafting to back fill
- send remaining companions on missions
- rinse and repeat
And the last thing I want to do is spend another 15 minutes doing the relog dance (for me each logout and back on takes 30 seconds to a minute; 5 year old computer will do that).
In addition, because I am actively crafting items in all six crafting skills (one on each character), I rarely need five "good" missions per character. Add to that, that I need all materials anyway and I am never looking for one mission in particular. In fact, on my slicers (I have two at 450) I am more likely to run Credit Drain over Unsliceable, because I want the discovered missions more than TRs (I have 2.5 stacks of TRs sitting because I only use them for myself and friends/guildies [and I don't charge them]).
Lastly, when I am calculating my cost to craft, I invariably round up, because I am assuming a worst case scenario: all gathering materials cost 500/unit (running missions), and all blue mission materials cost 250/unit (buying off the GTN). Purple materials vary by skill and I don't use them often for selling anyway.
Is this less than ideal? Yes. Am I losing out on credits by not fully optimizing the missions I run? Probably. Do I care? No. Why? Because I would rather spend 15 more minutes actually playing the game than relog dancing. Another example of the interchangeable nature of time and money in MMOs; it is costing me credits to be able to play longer.