Hi Terry,
Welcome to ECF!!!
Unfortunately I don't have infinite wisdom
But I do know that you can refill the cartomizers and it is fairly easy, as I do it all the time.
Here is a youtube video that tought me how to do it.
YouTube - Elusion Ecig - How to double your cartridge
(I hope I'm allowed to post a link to youtube, sorry if I'm not :S)
I followed that basically except I didn't use a fork to get the cap off the cartridge I use the wire from a bulldog clip and edge my way around the inside of the cap carefully because they are GLUED! Also I remove the little rubber O ring and I haven't gotten juice in my mouth yet, but I also don't over fill them.
If this hasn't helped let me know where your stuck and I'll do my best to help more.
Also I agree completely that the price is a joke but refilling them also helps cover the lost money of the initial outlay for the cartomizers. So 5 cartomizers for $20 but then you can refill them ~4-5 times for the price of the e-juice which makes it alot better.
The $20 shipping is VERY expensive but generally if you order in the morning of a week day they come the next working day which is AWESOME!
I haven't emailed them with any questions so I can't comment on that but by the sounds of it they suck at getting back to you unless they are getting money regardless, which is terrible.
I haven't been told they were out of stock on any cartomizers that I have ordered and I get 16mg as well.
The only real way to offset the price of shipping is to order a bigger quantity but needing to do so is really off-putting especially to new users who are unsure if the elusion is for them.
I have a joye 510 as well as my elusion and have only used it when my battery has run out on my elusion. But with that being said my friend who also has an elusion tried my 510 and has now ordered 1 as he really likes it so I guess it is all a matter of preference.
A quick suggestion from my experience is that elusion flavours are not as good as the e-juice I've tried, I didn't like their coffee or apple in future I will only get plain 16mg cartomizers from them and once used I will just refill them with the flavours I like.
Also some of the cartomizers I have seem to run out quicker than others which can be REALLY INFURIATING considering the "premium" cost.
Sorry for the long winded reply.
-dmtdude.