I like CheekyMonkey's sampler pack idea. Even in 10ml. Say a 5 pack from the 4 or 5 different categories (
tobacco, fruit, taffy you know similar flavors, even a 2 fruit and few taffy flavors). Pick your top sellers.
If I read you right, that would be 15 sampler packs. I have 15 categories now, and am looking at the possibility of adding another category or
three in the near future. I'm not really sure sampler packs are doable.
On the other hand, I could probably do up a top-sellers pack.
Looking at non-six-pack purchases, the top 10 are:
1) Oba Oba
2) Tiramisu
3) New York Cheesecake
4 )Hypnotic Myst
5) Strawberry Cheesecake
6) Apocalyptic Lemonade
7) Apple Champagne
8) Sweet Gingerbread
9) Bittersweet Tears of the Apocalypse
10) RY4
I am pleased to inform you it was bad cartos, not your awesome
juice 
they were the Boge 510 LRs that came with my Kgo.

And yeah, I'm a little more than half thru my banana cheesecake lol I'm definitely going to have to order more when I get paid, its going quicker now I'm using a bottom feed clearomizer. (which I love BTW)
Anyways, I think if 5ml's are a pain, don't offer them on your presteeps, if you decide to go that route

I also suggest adding a waffle flavor to the line up, seems like it would round out the list. I should try a waffle flavor with my next order. And a capaccino (sp?)
Whew! I'm sorry it was bad cartos, but I'm glad it wasn't the juice!!!
Poor Deej.

Let me give you a hug.
Thank you, Z!! Purrrrrrr
Deej already has a 6-pack which is 15% cheaper than buying 6 bottles separately.
I'd think one of the key goals would be to save Deej some time and effort by allowing him to make big batches of some flavors. The more options and combinations available, the more time and effort Deej has to spend keeping it organized.
15 flavors x 1 size x 1 PG/VG ratio x 1 flavor strength x 2 nicotine strengths = 30 pre-mixed, pre-steeped flavors on hand at all times
or
15 flavors x 1 size x 1 PG/VG ratio x 2 flavor strengths x 2 nicotine strengths = 60 pre-mixed, pre-steeped flavors on hand at all times
or
230 flavors x 9 sizes/bottle types x 10 PG/VG ratios x 5 flavor strengths x 10 nicotine strengths = 1,035,000 possible combinations. (More if you add child-proof vs non-child-proof bottles.)
It grows exponentially. No wonder the poor kitty is so tired.
heh... yeah... storage space could rapidly become an issue!
===============
In order to do bulk-mixing with the equipment I've got, I'm looking at a minimum of 200mL per flavor-strength combination. That translates to 20 10mL bottles. Assume I'll do the 3 nic levels (8, 16 & 24). 60 bottles that have to be stored while they steep. However, taking into account the non-juice aspect, I need to do 30 bottles of each flavor-strength combination so as to avoid a hassle with label-printing. Now I've got 90 bottles. Good thing I can bulk-mix up to 500mL at a shot!
For the pre-steep idea to work at all for me at my current staffing level, the flavor-load
must be fixed at some percentage. I chose 125% as it seems to be most common. I also don't see offering a cap-choice at this time... the bottles have to be capped once they're filled, and changing the cap on a bottle kills 2 caps... the one I take off would have to be discarded, since it will have absorbed the odor of the juice.
If I go with child-proof caps, then I'm more or less aligned with ECF recommendations as well as being able to get them from my bottle supplier. If I go with standard caps, I've just INCREASED the per-bottle cost by 21 cents... standard caps are not offered by my bottle supplier, so I'd have to get those "after-market".
So... yeah... the pre-steep line (however that turns out) is going to be locked down in terms of options to only which of the 3 nic strengths you want. If something in the pre-steep line doesn't work for you, then there's still the custom-mixed line.